My XP on older Dell Lat lost mains and when it came back on (cold boot) it lost my Avast home 4.8.0 and I tried to run a 3d drafting prog from my USB stick, and it would not launch. I tried the stick on one of my other older Dell Lat Laptops, and it ran just fine. I am using the sick puppy (Dell Lat with problems) just now so it is not ready to be taken out and shot.
I removed the Avast and downloaded a "fresh" copy. It was the 5.0 and would not run. I downloaded to desk top and then installed and tried to run, no go. I have installed and removed this prog at least 10 times with no joy. I even downloaded the 4.8.0 again but, no go either. I tried to go back and restore from a month ago, it won't let me do that either. I have downloaded and run numerous prog (a few from this site) but none show any sypware, trogan or any thing else that would cause this. In fact, most show that this thing is working just fine

I can read and I can run "repair" software but, I don't know the guts well enough to be able to trouble shoot this odd one. Anyone haveing a bit more know how and imagination who is willing to share, it would be appreciated !
Thanx in advance
OTD