Tried installing 3dMark2001 - says that my CPU doesn't support MMX, yet I'm running on a P4?!?!

[Ryan]

Hmm, what would cause this? I need to run it because my previous motherboard and video card were conflicting with each other (according to ATI and Intel - causing HORRIBLE performance), so I just bough a newer motherboard (newegg refurb). Now I need to test my junk out and I can't