Smurfie,
I would suggest that you completely uninstall ad-ware and then run a disk cleanup (Click on the Vista Orb>Run>and type in cleanmgr and press enter) and click on "Files from all users on this computer". Once finished, reboot. Download a FRESH copy of Ad-aware 2007 from
here.
Please tell me if that fixed the problem. If it didn't there might be something more serious going on with your computer. Hopefully there isn't though.
-Michael
Ad-Aware 2007 Beta Tester and Support