Vista - DCHP Service failure

My roomates computer has an issue that I have not been able to solve all week. here's the gist of it. The computer connects wireless, and is able to get an IP from router. I can ping the router, and other computers on the network. All other comupters on network are able to access the internet.

One thing that is happening is the DHCP Service keeps stopping on me. I've perused the posts on here looking for answer's. Here's a list of all I've done.

Disabled then enabled wireless adapter
uninstall/reinstall wireless adapter
manually set IP address
repaired winsock/winsock2 entries using LSPFix.exe and "netsh winsock reset" command (elevated to admin)
ran virus scan (AVG 8.0.169) with no hits
ran AD-aware SE (1 hit, removed, did not solve issue)
ran RegCure with 999 hits, cleaned, did not solve problem
Try'd to do a "system restore"..but the computer couldn't do it (hard drive has 6% free space)

I'd give a screenshot of the error, but its on another comp. Here's what it says:

"Host Process for Windows Services stopped working and was closed. A problem caused the application to stop working correctly. Windows will notify you if a solution is available."

Any help is appreciated.