I’m sorry but I’m not Harry Potter with special powers and I don’t have a crystal ball, so it’s a bit difficult to offer advice if the problems are not fully explained.

I’ll ask some more questions:
1. When denied access, do you mean the screen darkens and you get a prompt that you have to reply to?
2. When Vista immunises SpyBot items, do you receive a message or something else?
3. You’ve posted it twice, what does (sp) mean?
4. You say you’ve never been successful in returning the system to a previous date, do you get a message or something else?
5. A different version of Vista won’t make any difference. In fact, more features = more problems!