system
7
I have the same problems with the most recent version of Avast, 9.0.2011.263, but this time on Windows XP x64.
After installation the login screen does not show any more, and the computer hangs.
After removal in safe mode I installed the previous version, 9.0.2008.177, and this works without problems.
Have had the same problem on a clean install (new laptop) and on an upgrade from a previous version.