Check and fix this in HijackThis:
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\about.htm
Any idea what this file is for?
If not, just delete it.
Download CleanUp! http://cleanup.stevengould.org/ (Alternate Link if main link don't work - http://www.greyknigh...spy/CleanUp.exe ) and install it. Run CleanUp! and click on the Options button. Uncheck 'Scan local drives for temporary files'. Also uncheck those two Newsgroup entries if you don't want to delete them. Click OK and then click on the CleanUp! button. Let it run. After it's done, choose Yes to logoff.
You should be clean after doing that.
To help prevent future spyware installations/infections, please read the Anti-Spyware Tutorial and use the tools provided.
Are there any problems now? If not, you should be set to go.