Hello, I think this is a little off topic, but I don' know where to ask for help

....The problem is when I'm chatting with someone, I think I have an spyware bot installed, it sends auto messages to my contact, every like 20-25 minutes, it's a real pain!!

I've tried deleting it using Ad-aware, Spybot but it keeps on doing this, have anyone ever had a problem like this??

Any help would be greatly apreciated ^_^!!