When starting Scrap Dragon Xtreme, you may get an error message 'Invalid Class'. To Fix:
Open the command prompt, type wmimgmt.msc, and hit enter
Right-click WMI Control (Local), and then click Properties.
If Win32_Process shows ‘invalid class’ follow these steps to repair the WMI
1. Open the command prompt as an administrator
2. Type net stop winmgmt and press Enter. If prompted to stop dependent services respond Y.
3. Open a Windows Explorer and locate the path to C: windowssystem32WBEM folder and rename the Repository folder to something else like Repository_OLD
4. Restart the computer
5. In the start menu type cmd
6. Type net stop winmgmt and press enter
7. Type winmgmt /resetRepository and restart the computer.