VIEWSONIC VS13172 - Manual (Page 32)

ViewSonic VOT125 24
2.2 Recovery from HDD
Quickly press the F3 button on the keyboard. The window below appears. Click
OK to Start Recovery.
NOTE
If Windows operating system starts up before you press F3 and you still wish
to run System Recovery, restart the PC Mini then follow the same procedures
above.
3. Another confirmation message appears as below. Click OK.
4. System recovery is initiated and the following screen appears.