Unable to uninstall AIS

I cannot uninstall AIS. After uninstall from Programs and Features, a reboot brings me to enter my password and my keyboard and mouse do not work. I have to boot from the installation disk and roll back to an earlier restore point to boot up and get my keyboard and mouse to work. I tried disabling AIS before uninstalling with the same result. A search of FAQ said there are some software conflicts. OK, so what do I do now? Any ideas? Your help would be appreciated. Thanks.

I am running Windows 7, Home Premium, 64-bit, fully updated.

Try using the uninstall tool

http://www.avast.com/en-us/uninstall-utility

Or follow these instructions

http://forum.avast.com/index.php?topic=113402.msg886449#msg886449

A search of FAQ said there are some software conflicts.
did you remove any previous used AV before installing AIS ?

I originally had the free version of AV. I liked it so I purchased AIS and have used it for sometime now.

I used the cleaning tool two different ways with the same result. I uninstalled AIS from prog. & features, then went to safe mode and ran clean tool. When I got back to password entry my keyboard and mouse did not work. In these attempts I had to boot from the windows install disk, roll back to earlier restore point. I also tried just going to safe mode and ran clean tool. When I got to password enter same thing.

I also used the registry edit even though I had no 39 error. Same result.

I also removed keyboard in Device Mgr, rebooted and let windows reinstall the keyboard. I then did the same thing with the mouse. So both are freshly reinstalled. I then re-did the things above with the same result.