Dont do it like that. Just change the serchpath for your python. read the manual (this si by the way teh firt place to start anything):
http://download.autodesk.com/us/maya/2008h...nterpreter.html
This describes how to configure your new python.
Then change your envrionment to use that python (refeer to your pythons manual, maya respects this)
Theres no guarantee it will eve work out for you! I would recomend using it externally as otherwise you can get into deep problems.