The problem is that the DB1321ar.hlp entry in the registry is an invalid data type. My guess is that it is in a Help list in the registry and is of a different data type than the Help list requires or expects.
An easy way to solve that is to find that entry in the registry and delete it by hand.
A harder way to solve that is to tell me more about it, all the details (the exact entry, what part of RegVac is finding it, etc.), and let me try to figure out a way for RegVac to work around that.