Massive Spyware Infection

Update:

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I was able to speedily Control + Alt + Delete, click on the first suspicious-looking process I could find, and end it, all before one of the annoying Antivirus Live popups blocked Task Manager. It must have been the AntivirusLive process, because once I did that the popups ceased, the incessant fake scanning ceased, and I could once again execute programs.

With newfound hope I hopped online and downloaded a bunch of anti-spyware programs, including Malware Bytes and Spybot Search & Destroy. Unfortunately, S&D could not connect to the server, and thus wouldn't install, but I got Malware Bytes up and running and removed 4 trojans with the first scan.

Since then I ran a full system scan that picked up nothing, and my computer seems to be back to normal in terms of not showing any symptoms listed in my first post that would indicate an infection. Still, I'm anxious about logging in to anything important (email, Facebook, MS, etc.)...does it appear that I'm safe? Antivir and Comodo Personal Firewall are working properly, Adaware, Antivir, and Malware Bytes full system scans detect nothing, and again, everything seems to be running smoothly..but as Swerve said, lord knows what Malware programs I really have/had, and whether or not they found another way to survive and dodge my scans.

So am I safe to use my computer normally again? If not, what do you recommend doing? Thanks again for all the help!

If by "normal" you mean the same actions that caused this, then no. But if you've now learned something? Safer than before is certainly a possibility.

You might also want to burn an antiviral/malware boot CD... take your pick.
F-Secure, Trinity, and Avira which might pickup more if Windows isn't running, [url=http://devbuilds.kaspersky-labs.com/devbuilds/RescueDisk/"]Kaspersky[/url] is beta, but works

eh, forgot Hiren's sort of an all-in-one rescue clutter cd