I have only been troubleshooting windows 7 with 64 prosessor for maybe about 10 hrs. since I started having the update problem and what ultimately worked for me was to open control panel,search for windows defender,run the scan for spyware and other potential unwanted software.It will say that it will take a few minutes,but when I grewup that meant (3) not (30 mins).Be patient,,it will finally complete!Keep checking freqently to make sure that this process does not stop working on a particular prgm.scan for more than say 15sec's ,if it stays lockedup you may have to restart the process.And this is either a big file,or one of the problem files causing you grief!Once completed you should see a much improved performance increase from your system.If not however,there still may be other issues that your system is having to deal with.Other things to consider:Make sure that you do not have old software still installed in your progams that you do not need,such as norton,mcfee,or other antivirus software still installed or running on your computer as this would mean you have to go thru multiple firewalls instead of 1,for firewalls more means...SLOWER! My laptop runs like it was new again.