After installing, some folders became locked...

Hi there, i have concerns with my computer. After installing some programs, some of my folders became locked, it say that access was denied. how can that be when i am the owner?

i personally think this is a virus that got into my computer. after the installs, i looked through my folders and there was this file that was created in each folder... not by me. but it says, "Thumbs", it is a .db file small size, around 16 kb. I can not delete this file.


AFter finding out about this, i uninstalled the programs i installed the day before but the files still remains... any idea what this might be?


-Toe



p.s. - if i have this in the wrong section, please place it in the right area and let me know that it has been moved.