If you can upgrade it, I don't know.
But since you ask, here is my 2 cents worth. The G72's are basic notebooks designed for home use. I wouldn't think that upgrading the processor would do much for you. I mean, its only what, a 260mhz upgrade in CPU speed with very basic non-performance type hardware. I gotta think its not going to do a who lot for you on this budget minded notebook.
The i-3 it has is probably a very good match for the unit.