Howdy,
Delete the following File indicated in
RED if it still exists.
C:\Program Files\Netscape\Netscape\Plugins\npwthost.dll
Download
ewido security suite from here…
http://www.ewido.net/en/download/
Update it’s database from here..
http://www.ewido.net/en/download/updates/
Run a scan and let it clean the PC. When it's finished...save it's log and post it here.
Also, Open HijackThis>Config>Misc Tools then Click Generate Startup List log and post that here.
Do you have a popup blocker installed (other than the Google Toolbar)?