Question in XP PRO

when installing and restarting after its done, my computur would freeze. computer is setup for for muti users. and wouldnt go into a user when clicked

what happened???

Do you have any other AV software installed?

See e.g. http://www.avast.com/forum/index.php?board=2;action=display;threadid=2498
or http://www.avast.com/forum/index.php?board=2;action=display;threadid=2632