Hi

Try the following:

1. With the MEP open, select File, Settings, Reset program settings to default
    
2. Close the program
    
3. Click Windows start button, Power, Restart
    
4. Once Windows has restarted , wait a minute or two then start MEP again

Note:

1. Rebooting the computer using power off and back on again does not force Windows to reload all the drivers unlike a Restart
    
2. Resetting MEP back to default will lose any customisations to the programs settings you made.

HTH

John EB