Can't access HTTP, Can access HTTPS--What's wrong here?

By planetearth ·
Hello, all! I sure hope someone can help with this.

One of my client's PCs started having a problem last week. Long story short, the user can't acces HTTP sites using IE 7 or Chrome after the PC has been on for 5 minutes, but she CAN access HTTPS sites as well as use FTP, e-mail and other Internet-related apps. If she reboots, she can access HTTP sites again, but only for a few minutes. Then she gets the "Page cannot be displayed" error.

I connect to the PC via TeamViewer, LogMeIn and/or GoToMeeting, which work fine. The client has no XP installation CD or backup, so I'm limited as to what I can try. I also can't run the Windows System File Checker because she has no disc.

There is no proxy server showing in IE 7 on her Windows XP SP3 PC. I suspect it's a proxy server issue, but even if I force IE to use a proxy server, she can't access HTTP sites. Nothing is selected/ticked/checked in IE for proxy server use or "automatically detect settings", and enabling any of that stuff doesn't help. I'm assuming there could be a file or Registry corruption, though I can't confirm it since I can't run SFC.

This was probably caused by virus/Trojan infections (Trojan.Tracur, specifically), but I've removed all traces of the virus with AVG Internet Security and Malwarebytes.

I've done everything I could try, including:
-Reset IE 7/Disable add-ons
-Windows XP Network Diagnostics returned Error 12029
-Reset TCP/IP stack
-Reset Winsock
-Remove/re-install Intel NIC in Device Manager; Update NIC driver
-Reset Windows Firewall

I've reset everything I can except for the core Windows system files because she doesn't have her XP disc or a backup. There are no System Restore points before the virus infection date (even though System Restore is enabled), so I can't revert to that.

She's going to try "Safe Mode with Networking" to see if she can access HTTP sites for longer than 5 minutes; I'll let you know how that goes.

Does anyone have any idea what else I can do here?

Thanks in advance!


UPDATE: The PC works just fine in Safe Mode. The user has no problems accessing HTTP sites for as long as she wants to in Safe Mode. I found no entries in the Registry as to what might be running on startup. CHKDSK found some 1408 index-related disk errors and fixed them, but nothing serious. Fixing those errors didn't help.

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