I have two computer, all use the free home version.One alway goes crush after intalling the version when restart.when it happens, I can do nothing but move the mouse point, numlock is dead.If I hold "shift" when restart, the crush won't happen.I uninstall the avast, everything is ok. I use other antivirus software, no crush.
For another computer,the crush happens only sometimes, the symptom is some when crush.
I am in China, and I use the winxp sp2.In the internet, I have searched the same problem, to my surprise, a lot of people get into the same truble. I believe avast 5.1 can conflit with some function of the system, or other software.
Hope it can be solved soon, because I love it.