I found the instructions at http://www.bleepingcomputer.com/virus-remo...t-security-2010
to be very helpful in dealing with a friend's virus problem. But the problem arose that she had AVG's Resident Shield running at the time she executed the rkill.com cleanup utility. Consequently, RS flagged every change that rkill effected, and evidently dealt with them very heavy-handedly.
Some of the viruses much have been attached to basic Windows processes, and in quarantining the viruses those processes were removed as well. As a result, her computer now lacks basic functions such as PCP-IP, and among other things, cannot go online. It remains to be seen if AVG has eliminated these things permanently or if they can be resurrected and then the rkill process repeated, sans Resident Shield, for a more precise and benign kill operation. If worse comes to worse, I think a Windows Recovery disk might selectively restore the missing functions.
So I would caution people to disable resident virus protection when performing these kinds of cleaning tasks. That's probably very rudimentary, but it was beyond them and it escaped me and we were doing this over the phone.