That machine is x64 only.
 
I have no problem running 32bit on other machines for certain things but I think you would be shocked at the difference a newer x64 machine would make for you especially if you are running alot of VSTi's and don't want to freeze or bounce things to audio. (It looks like you have some pretty heavy hitter libraries listed in your sig.)
 
Give the support guys a call and ask if they would do a remote session with you. Cake has a really Great support group that are more than willing to help.
 
Best of luck to you!
 
Kind regards,
Rick