Anyone know why

I cant type R or Enter or when I can I have to hold that key down for like 10 secs before it registers?
I ran spybot Malware Avast and blew out dust... Keys dont stick its not that. I thought it all started after I downloaded a Gladdy ... I have deleted since then. Thank you

Could be a hardware issue? Do you have another keyboard you can plug in and test it with?