We haven't heard of that when run manually, but a few users have encountered this when run from a scheduled task:
http://www.kinook.com/Forum/showthre...?threadid=2691
VBP is calling
CoCreateInstance for the CLSID of the Builder component, which is returning an error code of REGDB_E_CLASSNOTREG. One possibility is that some registry values are corrupt (you could try reinstalling VBP), but since it only happens sporadically, my guess is that something (active scanning virus or other resident software?) is sometimes interfering with the normal registry lookup. You could try
disabling or uninstalling background apps, or start Windows in
Safe Mode, to see if it helps isolate the problem.
The DCOM standard marshaller also gets involved in the creation process (oleaut32.dll, registry key
HKEY_CLASSES_ROOT\CLSID\{00020424-0000-0000-C000-000000000046} and others), and if any of that is messed up it can cause issues as well.
Other options would be to repair Windows or repave the machine (format drive and reinstall Windows).