Avast Help?

So, about a month ago I updated avast to avast 7.
Well, after I restarted my computer, nothing would show up, so the only thing that I could do was a system restore.
After the system restore, to a few days earlier, avast stopped working, and I’m not sure why.
I tried to uninstall avast, update it, runs scans, etc., but nothing is working.
When I try to run scans it tells me there are no more endpoints.
It won’t let me uninstall or reinstall it either.
Help please?

http://forum.avast.com/index.php?topic=96561.0