yes, if i remember rightly you need you OS disk (win2k / XP)
simply boot to it, start setup, DO NOT press R for recovery console, process with the "install" it will find you current installation, press R for REPAIR current installation... let it do its thing (you shouldnt lose any data btw, i say shouldnt, theres no garuntee)
anyway, follow it through till you get to "INSTALLING DEVICES" then press shift and F10, you should get to command prompt, then do what you gotta do! then just exit, let the install go through... then reboot