uninstall the win2k upgrade. copy all of your server shares (share name ) to a piece of paper.
now either reformat the server and install the server with win2k. if you have data on the server and you need to keep it . you can move it to an additional server.
If the data is to extreme delete all the printers and rebbot after uninstall. the problem is the printer drivers. the drivers are loading crashing the system .
if this is truely a "print server" and nothing more. safe your selk the head . get the printer info and share name and reformat. it is cleaner and will not leave junk hidden on the server. Down the road you will be greatful you did.
Hope this helps. I had to do the same thing . I had 20 printers attached to the server. I wasn't much fun but I am glad I went with a clean install.