Active Directory Computers and Users Snapin

There can't NOT be an x64 version of this.. I have got to be missing something..

Basically my over priced works PC will have to be reduced to a full time gaming machine (which will be such a shame..) if I can't access AD.

For no apparent reason I thought I'd build myself an x64 machine at work to (at some point) replace my current 32 bit XP Pro machine. This is my first software stumbling block after spending two days fighting hardware issues and today spent mostly crashing whilst trying to join a domain. 

I'm surprised I can't find anything obvious to tell me how I can access my 2003 server from my x64 machine.. It's not a weird request after all..

Hopefully I'm just missing the glaringly obvious but running adminpak.msi from the server just tells me to go back to gaming. Anyone help me out?

For now I can manage with Remote Desktopping onto the server and running the snap in from there, no big deal I don't spose but for people without admin access to the server this would be a major issue.