If you've found a solution that works for you that's fine, but it's worth a look in the ScreenShots folder occasionally so as to delete any unwanted TGA files.
I"ve found that altough I edit the shots and move them from Fraps to My Pictures , Fraps still keeps them so I delete the straight away.My PC has a RAID hard drive so I find it seems to retain data no matter how hard I try to delete it!