wolfbm09 :
Correct me if I'm wrong but as, USAFRet mentioned, if it's windows don't they limit your windows installation uses?
All depends on the specific license.
With an OEM (preinstalled) PC, that license is tied to that original motherboard.
And it differs slightly between Windows 7 & Windows 8.
If it is a Retail license, then you can reinstall that on new hardware.