Hi again...
I found this on another site...
Samsung ATIV Smart PC 500T factory reset
It is a lot easier than you might think to reset to factory settings.
First bring Up the onscreen keyboard.
Once it is up, press the shift key.
The shift key should be highlighted. Now press the power button that should be located in the bottom left hand corner.
You now have a few options. Select reset, it will ask you if you would like to simply reset your computer or to erase all files.
Select the option to erase all files, the reboot should take about 30 minutes but your Samsung is now reset to factory settings...