schedule a boot-time scan of spybot.
else run ms antispy or adawre or spysweeper in the SAFE MODE.
use ccleaner to regularly clean ur cache, junk, etc. download it from www.download.com
it shud solve ur problems.
First of all do you regularly update the definition files for Adware. You can do this by going to the site www.lavasoft.de
try updating the definition files and then run the scanner.