Windows 7 Compatibility Issues

Go into your Nexon folder, right click the GameLauncher icon, then click the comparability tab and make sure that nothing except the "Run this program as an administrator" tab is checked. Click Apply and Okay and send a copy to your desktop and all should be well. If it is the first time ever booting up MS on this computer you will get the pop-up saying how the program has compatibility issues but just click okay or ignore, whatever you have to do to close it and as long as the above is done you should be able to run MS.