Try running WebRoot in Windows 'Safe Mode', and make the fixes there.

Also get HijackThis!, and run it in Windows 'Safe Mode', copy/paste the
HJT logfile to, I Am Not A Geek's HijackThis Log Analyzer, and 'Fix'
any obvious RED flags with the HJT scanner, while in Windows 'Safe
Mode'.

Get Intermute's CWShredder, and do the same thing.

Merijn's HijackThis! scanner: http://www.merijn.org/downloads.html

IANAG HJT Analyzer: http://hjt.iamnotageek.com/

Intermute's CWShredder:
http://www.intermute.com/products/cwshredder.html