had a search and ye its hard to find anything on your pc. only upgradeoptions that i have found are for memory and all other items list your pc with 233 cpu, so it looks as if you will need to get a new mobo and cpu.
if funds are tight heres a few options to upgrade to if your not looking for anything that flies.
click here cpu list
click here motherboard list
click here memory list
on memory you will need pc2100 ddr