No Internet After Virus Removal

I had a problem with a computer where after cleaning off a virus there was no internet access, and no network connectivity at all. When I tried to ping localhost, it said:

Unable to contact IP driver, error code 2.

When I tried to do ipconfig, I got:

An internal error occurred: The request is not supported.

Additional information: Unable to query host name.

After some digging through event logs and Google, I found the problem. The virus had damaged some drivers, specifically c:\windows\system32\drivers\IPSec.sys. That file was completely missing, so when I replaced it and rebooted everything started working again.

The original post where I found the solution is here. If that doesn’t work there are instructions to completely reset TCP/IP.



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