There are a lot of synchost problems going around right now. A large percentage to them are due to the Blaster family of worms.
Go to SARC
and download the blaster removal tool. Follow the directions, and then see how you are after reboot.
Let us know how things came out, please.
In W2k, it's going to be hard to stay "patched up" if you aren't using SP3 or 4. However, installing service packs has it's own set of perils. If you're OK after the blaster tool, you might want to ask some questions about SPs.