toshibitsu :
You should be running on Windows 10 for the best performance. Have you updated the BIOS? It is possible that the CPU could be hindering it's performance due to the age of it.
I agree, that's a really, really bad CPU. Upgrade that and then see how your PC performs.
Also, try a new install of Windows. Back in the Win95/me era it was highly recommended you reinstalled Windows after adding important H/W like a new GPU.