today valve updated OB engine, fixed CSS, TF2 to be able run on W2K again.
My W2k server can start CSS. But Garrymod Not
It show The procedure entry point freeaddrinfo could not be located in the dynamic link library WS2_32.DLL
the “freeaddrinfo” only availabe in XP and later
this only can fix by garrymod developer
more information about “freeaddrinfo” on W2K http://gobby.0x539.de/trac/ticket/425