Thanks John!
Hmm. Avast gives a warning that there is a virus in the VB DirectX samples... Does it is a false positive?
I get 4 files indicated have a generic malware/trojan in the bin folders of some of the samples. As those are pre-compiled executables of the sources provided, there would be no harm in deleting them.
I assume however that these are in fact a false positives...
Ralf