Do you mean filter keys?
Control Panel > Ease of Access Centre > Make the keyboard easier to use > Untick "Turn on filter keys"
Turning that off will mean holding down aaaaaaaaaaaaaa keeeeeeeeeeeeeyyyyyyyyyyy produces many letteeeeeerrrrrrrsssssssssss if that's what you meant? If you mean pressing 4 keys at once yields one letter, then no, you're ****ed.





