Thanks for joining the processor community.
I understand you would like to upgrade processor on your system.
I have been checking specifications on Acer web site and your computer seems to have a Mobile Intel® PM45 Express Chipset.
For processor compatibility, this actually depends on the board and the BIOS; therefore, this information has to come from Acer directly.
I can provide a list of possible and compatible processors for your chipset model see the link below for more information: