Hi
Thanks to all contributions.
I had just downgraded from Avast (paid) to Avast (Free) and my VB scripts no longer worked.
Working through this thread solved the problem - a dirty key left over from the original Avast application at HKEY_CLASSES_ROOT\CLSID{B54F3741-5B07-11cf-A4B0-00AA004A55E8}\InprocServer32.
Updating the (Default) key to "C:\Windows\system32\vbscript.dll" solved the issue.
Many Thanks
Chas