I think it might be a conflict between the 64 bit processors and Maya 7.0 (as its 32 bit, I think that 64 bit versions of maya only started on version 8, or it could have been 8.5) that could be why its running slowley.
I would see if the current maya PLE can be downloaded in 64 bit versions if so grab a copy and give it a go????
"No pressure, no diamonds" Thomas Carlyle