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web browser problems

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web browser problems

shooten2
Help!!!! I've got a pc I've been troubleshooting off and on for the last several days, and it's pretty well got me stumped... hopefully someone can help me with it?

Here's what's going on... First, the pc is a Dell Dimension 4600C, 256 Mb RAM, P4 2.4Ghz processor, Windows XP Home, Service Pack 2, all current Windows updates, (but still on IE 6)... the problem is, you can log on to the pc, and browse to a few websites, then it starts giving a page not found error as though it's lost it's internet connectivity. However, it's still pulling an IP address, and can still ping out to external websites - both by IP address and by domain name. I've uninstalled and reinstalled Internet Explorer 6, tried IE7, and I've tried running Firefox, but the same problem still occurs. I've cleaned a lot of spyware off of it (nothing too troublesome, just a lot of typical, pesky junk). If I restart the computer, the process starts over - I can browse to a few websites, then it stops. I've tried turning off the firewall, and disabling the anti-virus (AVG 7.5 - free version), still the same problem. I have noticed that if I change the IP configuration from DHCP to static, or from static to DHCP, I can browse again without having to restart the computer, but again it only works for a few minutes. I've tried just typing an IP address into the browser window, but that doesn't work either.

I've checked all the services, and everything seems to be in order there, and the error logs don't really tell me anything. I keep thinking that it's a DNS problem of some sort, but if that was the problem, couldn't I still access a website via its IP address? I have stopped and restarted the DNS client service, but still see the same problem. I've run Norton SystemWorks WinDoctor on it, I've run a Mcafee virus scan, a CA E-trust antivirus scan, and TrendMicro online scan, along with the AVG scan, and everything seems to be clear. Also, I've run SpyBot S&D 1.4, Ad-Aware, and Windows Defender (all in safe mode) and everything seems to be clean there also.

For what it's worth, when in safe mode, I don't seem to have any problems browsing - only in normal mode. I've got this feeling that it's something simple, that I'm overlooking the obvious, but I've been puzzling on it for so long now I'm about out of ideas. Anyone have any suggestions?

Thanks for your help,

shooten2