Holy crap, my computer's freaking out.?

Okay guys, I need some people with computer knowledge to answer this one.

For the past two months now my computer has had the following issues, and they get worse and worse everyday

Constant freezing

Random restarting, ONLY when I'm online.

Blue screens of death:

Driver_irql_not_less_or_equal

Irql_not_less_or_equal

Registry_error

Page_fault_in_a_nonpaged_area

There's been a few more, but they haven't popped up in a while.

Endless BIOS beeps. I already know that this one means bad ram.

I've ran mulitple virus and registry error tests, only to come up with nothing.

I've used Avast! Antivirus, Ad-adware, Spybot, Glary Utilities, WinASO Registry Optimizer %26 CCleaner.

So, tell me,

What is going on?

Holy crap, my computer's freaking out.?symatec

Don't listen to people who tell you to format your hard drive and reinstall the operating system. It's a common thing said by amatures when they try to solve computer problems. And don't worry, you don't need a new computer either.

Blue screens of death (especially the page fault error) can indeed mean that you have one or more faulty RAM modules. I recommend downloading and running a memory test application.

If after replacing the RAM module(s) your computer is still having the same issues, it might be a faulty driver. Make sure you update all your drivers to the latest version. If you're using Vista, try to download drivers that are signed by Microsoft or at least known to be Vista compatible.