install Win 7 pro from Win 7 Enterprise 90 days

System Manufacturer/Model Number: Too many to list.
OS: XP, Seven, 2008R2
CPU: AMD, Intel, VIA
Motherboard: Various
Memory: Corsair, Kingston, etc.
Graphics Card: ATI, NVIDIA
Monitor(s) Displays: Samsung
Keyboard: qwerty
Hard Drives: Maxtor, Western Digital
Internet Speed: 22 Mb/s @ home, 1 Gb/s @ server
Other Info: All of my systems still run fastest on XP 32-bit for the most part. Win7 is fun to play with, but I still prefer XP for raw speed, security, and functionality.