I have an oem version of windows 8 and I'm currently using the latest version of windows 10. I've heard that microsoft has supposedly tied the key to people's microsoft account so I was wondering if I wouldn't have to purchase a new version of windows.
If you have Upgraded to Win 10, and it is activated, you do NOT need to purchase a new OS.
Read and do this before
you change any hardware:https://support.microsoft.com/en-us/help/20530/windows-10-reactivating-after-hardware-changehttp://www.tomshardware.com/forum/id-3164428/windows-build-1607-activation.html