So whenever I want to play a bit, I go to run the MapleRoyal.exe and every time I get an error saying "error code : -2147024809 (The parameter is incorrect.)". This happens just about every time I want to play and the only way I have been able to run the game is by unistalling the game then reinstalling. Obviously it is very annoying to have to reinstall a game every time you want to play but its a fun game and I'd love if this bug was able to be fixed. My computer is running windows 10 tech preview and I have tried running the client as admin and that makes no difference. My guess is that whenever the game runs it is changing something in the files making it unable to run the next time, since I can only play once per install.
Sounds like your antivirus is deleting it. However, this is not a bug. Please repost in Technical Help.