You should be able to remove these items with a program like Spybot Search & Destroy and also using something like ATF-Cleaner or CCleaner. Tracking cookies are temp files and also can be deleted by using the built in Disk Cleanup.
MRU means Most Recently Used and really is not malware. Usually MRU's contain information such as the names and/or locations of the last files you have accessed. They are located ALL OVER your registry, and for almost ANY file type, not necessarily malware.
Your KEY phrase is torrent file which means that you have used P2P file sharing. If it was a Nero torrent then this means you wanted to get a paid program for nothing and you ended up with more than you bargained for which is a risk you take by using P2P.
A reformat is not usually necessary to remove spyware and really a drastic step to take. This is usually only recommended when valuable system files have been damaged beyond repair.
The best way to NOT get spyware is use safe surfing practices, if you still end up with spyware then the best way to begin to remove it is to follow all the steps given HERE
You also state that you used
ca internet security, ad aware, norton and avg.
The absolute rule is ONE anti-virus program on the computer, if you are running all these at the same time then you probably are lessening your protection. They …