TCP/IP.sys constatly gets corrupted

Windows XP pro, intelpro 100 NIC (Dell PC). As read in previous questions tcp/ip.sys file becomes corrupt. removed TCP/IP and reinstalled -- no help
Swapped NIC (3COM) no help.
after every reboot I have to replace the tcp/ip.sys file in the %root%\system32/drivers folder (upon 1st reboot it works) then after 2nd tcp/ip becomes corrupt again.
Suggestion before I format this box?????
reidjohnsonAsked:
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draxfeltonCommented:
Virus maybe?
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JSoupCommented:
How to determine and to recover from Winsock2 corruption in Windows Server 2003, in Windows XP, and in Windows Vista
http://support.microsoft.com/kb/811259
Rebuild TCP/IP stack in Windows XP when all else fails
http://searchwincomputing.techtarget.com/tip/0,289483,sid68_gci1193133,00.html
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cbmmCommented:
this is definitely a virus. its a trojan, i forgot the name of it. i fixed a pc last week by pulling the drive and scanning it with avg on another machine
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reidjohnsonAuthor Commented:
Used AVG and found 2 trojans one being BHO.DAB
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