Anitspyware 2008 messed up my computer...bad

Can anyone help me?

I was browsing the internet with Google Chrome in a website I visit daily when a message popped up saying along the lines, "This webpage may be infected." Usually, I immediately either close the site or click the "Back" arrow, but for some reason I fumbled and the message stayed there for a few seconds before returning to the original webpage.

When I closed the webpage, the Antispyware thing popped up and said "YOUR COMPUTER IS INFECTED WITH *this many* FILES!!!" And underneath the message gave the options "click to activate antispyware 2008" or "leave computer unprotected". I keep clicking "leave computer unprotected", but it still kept popping up, no matter how many I close. Everything in my computer stopped working, as if to keep that message popping up. I finally forcefully shut down the computer by holding the power button.

When I turned the computer back on the desktop would appear and the icons would show and everything, as if normal. But then after a few seconds the same message would pop up. Then after a few more seconds, the screen would black out, then turn all blue with a message that basically said "Go to Safe Mode and delete all infected files from there."

So I turned off the computer, turned it back on, and logged on to Safe Mode w/Networking. I tried running Spybot there, but it wouldn't work. I tried going onto the internet for more help, but it wouldn't work. So basically, my computer won't work and I don't know how to fix it with Safe Mode thanks to Anitspyware 2008. Right now I have to use another computer, which is why I can type this text right now.

Does anyone know what's wrong with it? Can anyone tell me at least how to gain access to the internet so that I can download anti-malware or any other program that might get rid of this? Any help or ideas would be greatly appreciated. I don't want to resort to buying a new computer and installing everything from scratch again, especially since this particular computer has all of my stuff in it.

Thank you very much.