|I don't know about your model, but generally it's not worth the trouble or expense to just upgrade a CPU. Most of the time they are running at (or close to) the maximum for the motherboard. It's usually more practical to install a new motherboard/CPU and RAM. |
But for OEM machines like Dell, that creates another problem. The Dell software will usually not work with a new motherboard, unless the replacement is purchased from Dell.
But wait for other opinions.
NTVDM = NT, Win2K and WinXP Virtual DOS Manager