My condolences; your
needs have out grown your system's capabilities
you
may be able to get by; if you add another 512mb memory and open your case and try running it with a house fan blowing into the case; if this helps then you will need to add more case fans to your system to reduce heat! this requires fans mounted at the interior of the case towards the front to bring in fresh air and also add a fan to the rear of the box to exaust out hot air ?