CPU features for 5.0.1

I cannot ugrade my VMware Player 2.0.3 to the latest 5.0.1. I'm getting the message that it "requires features not present on my CPU". I even uninstalled VMware Player, but didn't help. I looked at the minimum requirements and it say's CPU 1GHz (2 recommeded), RAM 1Gig (2 rec'd) and 150mb of disc space.  My computer has Intel Pentium 4 CPU 3.0 GHz, 1GHz RAM and has 209 GB of free disc space available. I have new cd software loaded onto my computer, but I cannot access because it requires VMware.  What gives?  Thank You, Jay.