keep getting taskbar "popups" in lower right corner of screen saying malware or spyware detected and then taking me to links to download software. Norton internet security states no threats however severeal trojan horses were resolved...Pop ups intrupt any work that I may be doing even when Im not on the web...How do I stop this???

First make sure your computer is uptodate then try such programs as Ad-aware, Spybot, Ccleaner or others. I recomend going to download.com and searching for spyware removal utilities.

From your description, it sounds like you've picked up some Ad-Ware.

Follow the instructions here> HiJackThis prerequisites,

and then post your log in a new thread in the Spyware, Adware, Viruses and HijackThis Logs Forum.