First of all check your antivirus friend,if your antivirus picks up a file from the infinity mu folder upon it's installation it automatically deletes it.Make an exception in your antivirus on the InfinityMu Folder before installing it,this will prevent the antivirus from checking that folder.If this is a new PC check your drivers,you may have a video driver missing.Make sure everything in your PC runs like it should,because the problem may not be in the client,it can be in your PC.Stop your firewall before starting the client or try with disabling the antivirus if you didn't make an exception.Make sure that you have deleted all the previous InfinityMu clients from your computer,if you try installing another InfinityMu exe and you didn't uninstall the previous exe or permanently delete the folders there will be a conflict between two exact exe's which of course will result in not starting the game.Make sure you have deleted and uninstalled all previous folders and exes of InfinityMu before reinstalling it again.Hope this helps you.