The Windows activation error code 0x80072F8F may occurred while trying to activate Windows 7 or Windows Vista. As Microsoft says the error 0x80072F8F is faced because a security error is occurred when you try to activate your Windows 8, 7 or Vista copy.
In most cases the Windows activation error 0x80072F8F error is occurred due to invalid date and time settings on the machine. In this article you can find the most working methods to resolve the 0x80072F8F activation error in Windows 8, 7 or Vista.
How to fix the Windows 8, 7 or Vista 0x80072F8F activation error code.
Method 1. Check your Date and Time Settings.
First of all make sure that:
1. In BIOS: you have set the correct Date, Time and Year.
2. In Windows: you have set the correct Date, Time and Time Zone. If not, then correct them and reboot your computer. After restart try to activate your Windows copy again. If the 0x80072F8F activation error persists, then set the date or year back (in a older time), restart your system and retry to activate Windows.
Method 2. Change the MediaBootInstall registry key from 1 to 0.
1. Press Windows 
+ R keys to open the run command box.
2. Type regedit and press OK to open Registry Editor.
3. Navigate to the following key:
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Setup/OOBE
4. At the right pane, double click at MediaBootInstall REG_DWORD value and change the value data from 1 to 0.
5. Click OK and close Registry Editor.
6. Open an administrative command prompt by going to:
a. Start -> All Programs -> Accessories.
b. Right-click at Command Prompt and click Run As Administrator.
8. Click OK at "Command complete successfully" message and restart your system. (If asked to enter your product key, then type it to activate Windows.)
9. After restart, try to activate Windows.
Windows 2008 R2 Command Line Activation
Open the Command Prompt as an Administrator to run the following commands...Check the current product activation status and obtain the Product Key
slmgr.vbs /dli
Remove the existing Product Key
slmgr.vbs -upk
Add a new Product Key
slmgr.vbs -ipk [ProductKey]
Activate Windows
slmgr.vbs /ato
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