Do this and you can use the same computer:

1)Click on start, then Run. In that window that pops up, type in REGEDIT and click ok.

2)In the Registry Editor window, on the lefthand side, go to these folders :

HKEY_LOCAL_MACHINE
SOFTWARE
CALCULATOR
MODE

In that MODE folder, on the righthand side, there will be a field called UCID. Right-click on UCID and delete.

3)Restart computer

4)Sign Up for PP or Emp Pkr

Thanks To AllinLife and 2+2