what difference between Microsoft Windows 8.1 Retail $120 vs oem $99

Solution
For something that you buy and you install, the main difference is who you can ask for support.
Retail, you can call Microsoft. OEM, you get to ask us...:)

With either, you can reinstall as needed. Only one PC at a time.

USAFRet

Titan
Moderator
For something that you buy and you install, the main difference is who you can ask for support.
Retail, you can call Microsoft. OEM, you get to ask us...:)

With either, you can reinstall as needed. Only one PC at a time.
 
Solution