If you can, you should download the LATEST updates for Adaware from click here and make sure it is up to date before you run it.
Also Spybot S&D from click here and again make sure it is up to date before you run it.
Ewido from click here this is free to download and use for 14 days and will automatically update itself daily during that period, once the trial runs out you can still use it but you must update it manually before use.
SpywareBlaster click here again you must update it yourself but will help to keep some of the c**p out.
Also CCleaner from click here don't forget to update it before use.
And I would also suggest you get a Firewall and install it, my personal favourite is Zone Alarm. The full version of ZA is not free but there is a free trial period, there are others available for free, just start another thread for advice once you have got this problem sorted.
You don't mention which Anti-Virus you are using or which O/S.