avast causes windows 7 to have a black screen upon login

After installing an old version of Avast (weird weird) and then updating it to the newer version, my Windows 7 would show a black screen and my cursor and be locked at the screen forever after the welcome screen (after login).

Restart, and same thing, after the welcome screen it goes into the black screen. So it isn't a boot problem, my guess is some driver or software that is hugely not compatible with Windows 7.

The way I fixed it was:

(p.s. write down these instructions if you need them because you can't run the Internet when booting off the DVD, for that matter you shouldn't be able to read this blog on the broken computer :\ ............ good point)

1. Put in the Windows 7 DVD
2. Hold down the power button (only way to restart the computer in my situation)
3. Boot off the DVD
4. Go through the prompts until you see the screen where you can click "Repair my computer" (bottom right of the screen)
   
5. Now select the option to recover from a system restore point.
6. Follow those prompts and then it will ask you to restart

My current theory is Avast Anti-Virus, maybe I need to download an installer for a W7 compatible version instead of updating a really outdated version.

The other things on the snapshot were Windows Updates, could be possible I guess, I am re-downloading the updates now so will update on that soon.