Accessing an old server

I have an old Pentium 4 server that I was able to get from a company going out of business, the only issue is how do I get into the machine as it currently has Win 2k3 server on it, but of course is all locked up.

Is there a way to get into it without brute force? Perhaps some tools I could use to at least see what is on it and if I can reuse the Win 2k3 server copy that is on there?

Any insight would be great as I am just searching around the net and thought maybe the bright minds at AntiOnline could help me out.

http://home.eunet.no/pnordahl/ntpasswd/

Try the Ophcrack Live CD.

Honestly, your best bet would be just to start from a fresh install, since you don't know what configuration settings they have changed. Unless, that is, you like digging through policies and registry keys.