Dunno nuffink about a "quick restart" on Windows 2000, but you have two other choices :
1. Standby - low power mode, computer still active, but turns on again at a moment's notice. Available any time, just choose it from the shut down menu.
2. Hibernate - memory contents saved to a disk file, then computer turned off. When you power it back up it remembers where it was. Quicker than a complete reboot. May require configuration through the Control Panel -> Power Options "Hibernate" tab, tick "Enable Hibernate support".
Caveat for (2) - shutdown and restart the beast from time to time, it can get its knickers in a twist and a reboot "clears its cache", as TD will surely advise if I don't get in there.