Hey guys, I'm new to this site but I thought this might be useful for a lot of people. I DID NOT come up with this fix but I don't think everyone knows that it will fix your install problems. I got this fix from the thread http://windows7forums.com/windows-7-support/1741-windows-update-not-working-crashing-explorer.html#post8198 about how windows update crashes windows explorer. This direct link to the website is prashant's new web blog. - Windows 7 explorer crashes on Windows update [solved] Well my windows update was crashing and my programs like itunes and steam and Call of Duty 4 were not installing due to a windows installer error. Well I tried the fix for windows update and it also allowed me to install my games and programs!!!! Sweet. If you don't want to go to the thread, all you do is go into the registry HKLM\Software\Microsoft\SQMClient\Windows\DisabledSessions rename MachineThrottling to _MachineThrottling Hope this helps.