MSCONFIG(win98) worked on early versions of W2k but your best bet is to get MSCONFIG for WinXP.
I have Win2KPro and use MSCONFIG for WinXP-works just fine.
I dont think W2K has MSCONFIG built-in that is why it is a seperate download from another OS. Go with MSCONFIG for WinXP.
P.S.
Dont forget to put it in c:\winnt\system32