Check Add/Remove Programs for anything nCase and CommonName, and un-install them. I know that nCase connects to a web site to install. Not sure about CommonName.
Check out this site for help finding programs that loading at startup:
http://www.answersthatwork.com/Taskl...s/tasklist.htm
Another thing to try if running XP is SFC /purgecache then SFC /scannow from "RUN".
And stay away from P2P software unless you know that the one you are using is ad-ware free. Good luck finding that! K++ is getting harder and harder to find.