Use a can of compressed air to clean the dust from all case filters, fans, and heatsinks. Really do a good job blowing the dust from the CPU heatsink and fan.
Run a utility program to measure computer temperatures. SensorsView or SpeedFan will do. Results?
Use the computer with the case opened. Results?
I spotted a nice Desktop PC on Ebay 3 years ago just after moving into my new house.
Not long ago my Motherboard broke due to a complicated matter.
The MB had bad CPU socket Pins and i'm not sure if that could be that problem now.
I bought a Case/Motherboard/PowerSupply Barebone. From Tigerdirect.com
Now my problem is, when i find myselfe doing high cpu tasks the system freezes, The Keyboard, Mouse evertything Just halts. When move large files or install large applications the system halts so i have to boot.
I know its either the CPU, Motherboard, Graphic card or RAM.
*Intel P4 Socket 775 533/800 Socket 3.2 GHz
*2GB DDR2/400 Corsair RAM.
*GeForce 6600 GT GDDR3 128MB AGP 8X
*16X LiteON DVD Burner