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cannot update windows

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cannot update windows

furyfist
My brother's computer cannot update Windows. It is a Compaq Presario running Windows XP Pro. It appears the IE cannot access the URL, update.microsoft.com. I tried accessing the URL with Firefox, but it just "times out". His Mccafee antivirus program also cannot update; when it tried to auto download the newer virus definitions, it gets stuck on "0% downloaded". I also cannot access certain other web sites, such as filehippo.com or yahoo email. I can go to gmail or other web sites without any problems. I scanned the computer with Spyware Doctor 3.2 and removed a few minor spyware; scanned with antivirus but found no viruses. I cleaned registry with Registry Mechanic and tried Winsock without success. Tried Ccleaner as well, but still cannot update. I checked firewall settings, security/trusted web sites, running processes, router settings, and even tried restore point, but cannot determine the cause. Everything was working fine up until 6/29/05, which was the last successful antivirus update. Any suggestions, before I format and re-install Windows?