Sometimes Medal needs extra permissions from your computer in order to run properly. You can run Medal as admin by right-clicking the Medal.exe shortcut and choosing run as admin.
You can choose to always run as admin by doing the following:

1. Find the Medal.exe shortcut and right-click it.

2. At the very bottom of the menu click `Properties`

3. On the box that pops up, click the `Compatibility` tab

4. Click the box that says `Run this program as administrator`. Click Apply and OK. 


5. Start Medal and enjoy!


*If you are still having troubles, please create a ticket