Before going further, run the 8.0.1 update patch.
I installed the patch, but it didn't change anything.
I also tried placing the network users in the Local Administrators group on the notebook he always works on. But also no change then.
I'm not surprised, but we had to rule it out.
Many users, including me, are unable to run except in an admistrator account. I haven't bothered to chase it down here becasue I normally run as admin anyway, but it's most likely a permissions issue. There are a couple of other threads about this, and one of them has a list of files and registry entries that require write permission on XP, I think, that can provide a giude, but I have not seen a definitive list for anything newer.
OK. Thanks. I'll look for it in the forums and i'll run a SpyMe check to see what's changed in the registry and the folders after installation.