If you have a legit key entered in the software to activate it should be ok. You can always try magic jelly bean to see your key you entered when you installed...
Yeah includes an option if you have a touch screen or not. My desktop and laptop are not touch screen.. Fix this and I may upgrade to win8 till then I will not make the change..
It sound to me like the key is sticking. I would take the key board out and make sure it is completely dry. Try some computer duster air if you have it.