McAfee Real Time Scan wont work! "Your Computer is at Risk"...?

I have windows 7... My computer has been acting up lately so I ran a system restore and set my computer to a previous date. When my computer restarted, McAfee hasnt worked right. It WILL NOT turn on real-time scanning. A pop up also keeps coming up saying "Your computer is at risk." It's driving me crazy. The time and date are correct on my computer... I tried the McAfee Virtual Technician and i've gone in and manually turned it on... you know, all the basics. Any help would be great. Thanks!