Hello, I am trying to upgrade a laptop for my daughter it's a acer aspire 5315-2153, I have upgraded the ram to 3 gig, and installed win 7, I also have flashed the newer BIOS 1.43, other than that it is stock. what CPU can I put in this computer to upgrade? She dosent play games just general kid stuff,IE pix, chat ,facebook etc. any help would be appreciated !!!! Thanks!!