I have a similar problem to this, I get the following error code Code 800B0100. The updates I am trying to install are the system stack update (KB2476490) and the SP1 update for x64 (KB976932). I have read around and know that I need the system stack update pre SP1 but I cannot get it to install it fails every time.
 
I have tried downloading the standalone .exe it also fails. I have tried resetting the windows reg components and resetting the windows update settings. I have tried clearing the SoftwareDistribution folder in the system directory. I have run the system update readiness tool and found that some other unavailable repair files that I do not know. Can anybody tell me what these files are and where I can get these files or a tool to help me repair them. I believe this is what is preventing the first update working.
here is the System update readiness tools log
	
	
	
		Code:
	
	
		=================================
Checking System Update Readiness.
Binary Version 6.1.7601.21645
Package Version 12.0
2011-06-21 10:50
Checking Windows Servicing Packages
Checking Package Manifests and Catalogs
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_2_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_2_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat        
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_3_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_3_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat        
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_6_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_6_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat        
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_7_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_7_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat        
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat        
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_for_KB2476490_SP1~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_for_KB2476490_SP1~31bf3856ad364e35~amd64~~6.1.1.0.cat        
(f)    CBS MUM Corrupt    0x800F0900    servicing\Packages\Package_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum        Line 1: 
(f)    CBS Catalog Corrupt    0x800B0100    servicing\Packages\Package_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat        
Checking Package Watchlist
Checking Component Watchlist
Checking Packages
Checking Component Store
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_19905f482e3c30f7.manifest    amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_19905f482e3c30f7    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_2387acc9495dfcbb.manifest    wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_2387acc9495dfcbb    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_23e5099a629cf2f2.manifest    wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_23e5099a629cf2f2    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_1af3213f123f9523.manifest    amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_1af3213f123f9523    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_1933027714fd3ac0.manifest    amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_1933027714fd3ac0    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_2547cb9146a0571e.manifest    wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_2547cb9146a0571e    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_25d368f05fbc2996.manifest    wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_25d368f05fbc2996    
(f)    CSI Manifest All Zeros    0x00000000    winsxs\Manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_1b7ebe9e2b5b679b.manifest    amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_1b7ebe9e2b5b679b    
Summary:
Seconds executed: 144
 Found 22 errors
  CSI Manifest All Zeros Total count: 8
  CBS MUM Corrupt Total count: 7
  CBS Catalog Corrupt Total count: 7
Unavailable repair files:
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_19905f482e3c30f7.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_2387acc9495dfcbb.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_23e5099a629cf2f2.manifest
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_1af3213f123f9523.manifest
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_1933027714fd3ac0.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_2547cb9146a0571e.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_25d368f05fbc2996.manifest
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_1b7ebe9e2b5b679b.manifest
    servicing\packages\Package_2_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_2_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_3_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_3_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_6_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_6_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_7_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_7_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2476490_SP1~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2476490_SP1~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_2_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_2_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_3_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_3_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_6_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_6_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_7_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_7_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_for_KB2476490_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_for_KB2476490_SP1~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_for_KB2476490_SP1~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
    servicing\packages\Package_for_KB2476490~31bf3856ad364e35~amd64~~6.1.1.0.cat
Customer Experience report successfully uploaded.  Thank you for participating.  For more information, see the Microsoft Customer Experience Improvement Program on the
	 
 
winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_19905f482e3c30f7.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_2387acc9495dfcbb.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.20861_none_23e5099a629cf2f2.manifest
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_1af3213f123f9523.manifest
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7600.16722_none_1933027714fd3ac0.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.17567_none_2547cb9146a0571e.manifest
    winsxs\manifests\wow64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_25d368f05fbc2996.manifest
    winsxs\manifests\amd64_microsoft-windows-ole-automation_31bf3856ad364e35_6.1.7601.21669_none_1b7ebe9e2b5b679b.manifest
These are the files I am specifically interested in but I thought it good to show the whole log as well. Any help would be appreciated. 
Thanks
Mardy