It look like it could be looping
In Windows go into Screen Saver------Settings and make sure that the "Loop Scanning" is not checked.
ok i unchecked loop scanning.
btw- its my dad pc, so full scan takes 4:34 minutes so his computer is actually pretty empty.
update: 1 log, after a minute the screensaver says "scan finished" xD
problem solved- not enough data on the computer!