I'm running Windows 7 64 bit on a dell laptop ( which is wireless) About 95% of my automatic updates fail with the code "800B0100" tried the "fix it" from MS, no luck. I try to download the "system rediness update tool" from MS but keep getting a page not found prompt. I turned off the windows and McAfee wirewall, but that didn't help either. I'm using a Netgear N600 router. Maybe it has a firewall. It's just a Windows problem though, all other updates ( McAfee, Adobe, etc.) work ok. I'm really stumped.