PLEASE FIX I CAN'T PLAY MC ANYMORE!

I downloaded minecraft like normally and, to my shock, it gave me an error message containing: "Access is denied. " why? I ran it in regular and admin mode. btw, I am the ADMINISTRATOR. :'(
I am about to rage-quit minecraft forever until I get this fixed. I also tried "re-installing it", but that does not work. I let it through my VIPRE firewall and it just won't work. that kinda (really) sux.