Unfortunately you have to purge your HDD; your system is infected with an malware/virus called "Windoof"....
just kidding with you... here is the solution for your problem (you are missing an important Windows 7 update)
Go here:
You must be registered to see the links
When you click the "Download" button, make sure you select the appropriate update for your system.
32-bit OS: Windows6.1-KB2670838-x86.msu
64-Bit OS: Windows6.1-KB2670838-x64.msu
Don't download both files.
After installation, restart your computer and try playing MotH.