I have just formatted my PC yesterday and installed both XP and Vista.
No problems on XP, but on Vista, even with Mentwar's hint, it still doesn't work.
I'd try copping XP's registry and adding it to Vista's but I'm pretty lazy to reboot now.
When I do, I'll post the results.
Edit: I was pretty sure that my info was stored into the registry. But I was looking for it and didn't find.
BTW, Mentwar's hint still doesn't work