Hi,
Some parasites known to interfere with Ad-aware scans but since you say it didnt work in safe mode either, you may just need to re-install it.
Go
here and download the latest version, uninstall your current version and install the new one, then download any updates and try again.
Aslo download Spybot S&D from
here install and update it and run a scan.
You should probably run some online virus and trojan scans too:
http://www.pandasoftware.com/product..._principal.htm
and
http://www.windowsecurity.com/trojanscan/