If this is an Orangebox (CS:S/TF2/etc) server, it sounds like it's working. Valve halved the framerate on all servers, so Win2k3 servers run at 250 FPS now.
That will change again in the future. You can read more about it here: viewtopic.php?f=44&t=5473
You can set the initial map for your server through the autoexec.cfg file.