Re: Scanreg/fix??
Scanreg is not an NT tool (i.e. Win 2K, Win NT 3/4, Win XP). It is only for Win 98 and ME. Even if you find a copy of scanreg from an older machine, I wouldn't use it. NT registries are quite different from '98.
To answer your question, I always try to get the latest SP on as quick as possible. I think the latest one for w2k is sp4.