Is there a way to disable the key lock that won't let you hit too many buttons?

Theres a game I'm playing where I need to sprint, jump, move with multipul keys while holding onto my shell and maybe hit some other buttons but I get that hellish beep and usually fall to 16bit death.

 

I thought you could press shift 5 times but thats not working, I think thats something else though.

 

Someone pointed out it's because I have a PS/2 keyboard.