Can't launch MapleKey..

[Anime]

I looked back to see if there were any suggestions that weren't mentioned, but I didn't see any. Hopefully someone stumbles along this post and has an idea.

I'll just post what I would tell someone to try:

Mess around with your compatibility settings (Right Click MapleKey -> Properties -> Compatibility)

Close off any unused processes to "speed up" your client.

I'm surprised you haven't ran into the Parameter error considering you have a Windows 10 OS.