In order to upgrade, we need to know what you have.
First state your form factor
Second, which country you from - in USA it is easy to find parts, in other countries - much more difficult.
FYI, with MT you can easy upgrade your processor to Q6600
[strike]CPU cannot be upgraded (Pentium D, Core2 Duo 1066MHz)[/strike]
it depends....
Anything else I can help you with?