Dear crestar,
64 Bit does not necessarily let the software run faster - if you have 4GB of RAM in your PC, that is a valid argument to switch to 64Bit - you have then ~500 – 1000MB more RAM available.
I am a bit puzzled - do you want to install the Signastation on the MetaDimension PC?
We do not reccommend to do so, that really throttles your RIP performance (RAM, Acrobat etc.).
Currently we have not finalized our testing of Windows 7 (remember, it is not even officially released yet) and honestly, testing Windows 7 64Bit this is not the highest on our priority list. So today, I cannot give a date - sorry.
Regards
Mark