Can ANYONE Solve This!!!???

Strangest problem I have ever seen. Received computer, many viruses,
malware, spyware. Cleaned, ran additional scans, found nothing.
Computer will connect to the Internet after a reboot, but cannot after
5 - 10 minutes, varies. Computer can ping any web address, not just
IP. So I CAN ping yahoo.com and get a response. Link lights are on and
good. Nothing has changed with DNS, Default Gateway, IP address,
Subnet Mask. I have put this computer on two differnet routers, same
problem on each.

Something very weird. If I disconnect the CAT5 cable from the router
for just a split second and then reconnect the computer can get online
again, but again, after 5 - 10 minutes it cannot.

I have uninstalled and reinstalled IE several times. Did a repair form
the XP disk (reinstalled all system files). Nothing helps.

Alos note it is not just IE. After the internet loses connectivity, I
cannot update any Antivirus programs or spyware programs (search for
updates). However, I CAN still ping.

I have tried getting to the router browser after loseing connectivity,
will not connect. Again, after a reboot or unplugging the CAT5 cable I
can.

If anyone has any idea what may be going on with this PC let me know.
I've tried everything I know to do.
.

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