I have a Compaq SR1901WM running Windows XP. It has the stock processor in it, a Sempron (P) 3200+ 1.8 GHz, but it now has 3GB of RAM, and I upgraded the hard drive to 320 GB. I bought an AMD Athlon 64 3800+ socket 939 CPU to maybe get a little more speed. When I installed the new CPU, something...