I was using Avast before my computer is reformatted last night

I dunno whether my files are infected by viruses 1st,
or avast has downloaded newly updated features which contained viruses inside..
(u know avast would auto updated by itelf)

when i launched my avast after the update..
it deleted all my important files in c:\windows,
it later made my computer needed a password to log in (i din set any pword before that), after i click cancel and log in, there was a blank.. and then it would auto log off..

I was really pissed off that nite..

hmm.. avast found that my files are infected.. so it deleted all those files.. over 2500+ files.. so sad..
after formatted, all my pics gone ~><~
anyway lar.. Avast is really good
next time should change the setting.. dun del all infected files ><
choose the option bout ask for confirmation first

those files are deleted.. and windows XP is gone =(