I decided to upgrade my Dell 1525 Inspiron laptop from Vista Home Premium (32 bit) to Windows 7 Home Premium (32 bit). I bought the Dell disks and ran the upgrade assistant first. It told me to uninstall two programs - which I did. I should say I do not want to do a clean install for two reasons (1) there will be so much hassle in re-installing programs, files etc. (2) people on the web who have this 63% problem report a clean install aslo fails at 63% and they are even worse off then before! I have now tried four times and each time it fails at the last hurdle at 63% when it is transferring files back to the system. A search of the net will show that several people have experienced the same problem (there is also one at 62%). After my first failure I tried the tips of unplugging the LAN/Internet connection; inserting MIG-UPGRADE-UGBIRE-PLUGINS etc.; I disabled most things in the startup list but each time it failed at the 63%. I left it running for 7 hours over night just in case the 63% needed time to sort itself out but it made no progress. I don't have any unusual software - Kaspersky Internet Security, Mailwasher (which I disbled during the last attempt) and a Western Digital external hard drive (which I also unplugged and disabled during the last attempt). Here is a copy of setupact.log in case it helps anyone answer my question but it does not appear to show any problems: 2010-05-14 15:28:53, Info UI Determining if we are in WDS/Unattend mode 2010-05-14 15:28:53, Info UI No need to hide autorun 2010-05-14 15:28:53, Info [0x0a000a] UI Autorun:Autorun core successfully initialized!!! 2010-05-14 15:28:53, Info [0x0a000b] UI Autorun:Autorun UI successfully initialized!!! 2010-05-14 15:28:56, Info UI AppWindow has layout style 0 2010-05-14 15:28:56, Info UI NavWindow has layout style 0 2010-05-14 15:28:57, Info [0x0a011c] UI WizardDialogPost::SetActive 2010-05-14 15:29:01, Info [0x0a018e] UI Passing command line parameter ("E:\Sources\setup.exe /HideWelcome /uilanguage:en-US /targetlanguage:en-US") to IBS. [05/15/2010 10:37.32.970] WudfCoInstaller: ReadWdfSection: Checking WdfSection [Basic_Install.Wdf] [05/15/2010 10:37.33.024] WudfCoInstaller: UMDF Service WpdFs is already installed - removing existing settings in preparation for setting new ones. [05/15/2010 10:37.33.046] WudfCoInstaller: Configuring UMDF Service WpdFs. [05/15/2010 10:37.33.075] WudfCoInstaller: ImpersonationLevel set to 2 [05/15/2010 10:37.33.154] WudfCoInstaller: Service WudfSvc is already running. [05/15/2010 10:37.33.183] WudfCoInstaller: Final status: error(0) The operation completed successfully. [05/15/2010 10:37.37.362] WudfCoInstaller: Created marker file C:\Windows\system32\drivers\Msft_User_WpdFs_01_07_00.Wdf. I would appreciate any ideas before I give up and stick with Vista.