I would suggest that you find another Anti-spy/virus program. Because as you have probably figured it out by now Trend Micro has poor protection, hence the abnormal behavior.
If you want very good protection. I would recommend that you purchase Kaspersky http://www.kaspersky.com/. (From a store like Future Shop, or Staples. So you have the physical copy of the program). From what I have heard about it. It seems to be one of the best protection programs out there.
Here's some free Anti-virus programs, that I use myself, they are very effective.
1 Ad-Aware 2008, Much more effective than previous versions and faster, does not suck up system resources like the previous versions, also there various skins to suit your preferences.
http://www.download.com/Ad-Aware-2008/3000-8022_4-10045910.html?hhTest=1
2 Spybot - Search & Destroy, its a little out of date but it works.
http://www.download.com/Spybot-Search-Destroy/3000-8022_4-10122137.html?hhTest=1
3 SpywareBlaster, blocks potentially damaging applications and programs from running.
http://www.download.com/SpywareBlaster/3000-8022_4-10196637.html?hhTest=1
4 Simple File Shredder, it isn't an anti spy, but it shreds unnecessary files including cookies and it speeds up system performance.
http://www.download.com/Simple-File-Shredder/3000-2092_4-10301332.html?hhTest=1
5 MRU-Blaster, detects and cleans MRU (most recently used) lists on your computer. By looking at these MRU lists, someone could determine what files you opened/saved/looked at, what their file names were, and much more! (And, in many cases, the lists are displayed in drop-down menus automatically.) (From website.)
http://www.javacoolsoftware.com/mrublaster.html
Also. I suggest that you stay away from online anti-spy scans. As it is not hard for a cracker to hack it, and insert some malicious code into the program which after scanning will give you even more virus's. (That's how my computer got infected once, and after that I have been advising people to stay away from them).
I personally don't like AVG, it screwed up my computer after I Un-Installed it, and Avast didn't work for me. And Trend Micro, has poor detection rates (I tried it a few night's ago (downloaded) and scanned, it found 3 items. I ran Ad-Aware after that and it found 18 items that trend micro passed right over).
And I would advise you to stay away from P2P, programs. As they are an excellent vector for infections.
Hope this help's