*sigh*
Here is a link to Autoruns, it's free and standalone, no install required.
Autoruns for Windows
Just unzip and place the resulting folder anywhere you want on your HDD and create a shortcut
to autoruns .exe to your desktop.
The Internet Explorer tab shows the BHO's.
Download HijackThis (the 2.0.2 version executable) and run it, it's standalone also.
HijackThis - Trend Micro USA
Save the scan to logfile and copy the results to the open field at this website and click analyze.
HijackThis Logfileauswertung
This site will give you a quick idea what baddie(s) may be there.
Update: At this time the analyze feature at this site hijackthis.de is disabled due to high service load.
It should be available later.
See the HijackThis forum with help dealing with baddies.
BleepingComputer.com -> HijackThis Logs and Virus/Trojan/Spyware/Malware Removal