How to Fix the Error loading Standard Calculator

1.       Close 10 Key

2.       Uninstall 10 Key from the Program Group

3.       Find and delete this whole folder and it’s contents…   c:\Users\”Your User”\Appdata\Roaming\PentaCalc.  If you type %APPDATA%\PentaCalc in Windows Explorer it will take you to this folder.

4.       Reboot

5.       Reinstall 10 Key

6.       It should work now