I'm using freestyler for about 2 jears now and I really like it!

This is really annoying becouse to fix it I have to restart Freestyler and remove the USB cable for a short while.

I've tried everything, new USB drivers, , motherboard drivers, .NET software upgrade (I read somewhere that it might help) but nothing helps!
My setup:
Dell Latitude D830, 1.8 Ghz Dualcore, 4GB Ram
Freestyler 3.4.4 (latest version)
6 scans (simple ones, 6 DMX channels each)
8 Parcans
Sweetlight USB-DMX cable
Freestyler output set to "Eurolite USB-DMX"
Its worth mentioning that I've had this problem before with WinXP, but it's quite a while back and i'm not sure how I fixed it back then. But it always ran fine on this laptop with these fixtures, so it should be able to work.
Someone any suggestions?