How do I find out a Windows key code?

Answer by  Chasseur (33)

If you have the Windows CD that came with your computer it will be on the back of that. If you do not have the CD, goto HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion and under "productid" will be your key code. I cannot stress enough the importance of not deleting any folders in this file. Your computer could stop working.

Answer by  LeheckaG (1826)

If you have a newer-computer, it should be on a label on the under-side, back, or side. If you have an older "brand-name" computer, contact their customer-service/technical-support & they will usually send or tell. Otherwise, purchase another Microsoft Windows copy & the code will usually be on the CD/DVD holder.