Dell :: Freeze + Loud Beep?

I got a new laptop in about June or so, and it ran great. I have McAfee for anti-virus, if that helps.

About 2 weeks ago, my computer started to slow down. A lot. My typing would lag on the screen, and some of the letters won't even show up.

I also seem to get an insane amount of pop ups on whatever sites I go on, and I get about 5 popups every hour, on the hour. When I scan, though, I get nothing.

Now, this is the worst part. My computer will completely freeze a lot. When it does, I'll wait a minute to see what happens.

Then, if I click the screen a few times, a single, insanely loud beep will come from the computer. This will happen a few times before I can actually use my computer, and I have to re-boot often.

My computer is insanely slow, like I said before, and it takes forever for it to finish starting up. Half the time, it'll freeze before I can even log in.

If it helps, this started around the time when I signed up for Facebook, if that has to do with anything. I've tried to do virus scans many many times, and I used the Dell Automated PC TuneUp tool. But, nothing seems to work.