I have found a couple of settings in avast 4.0 that do NOT mix well. (SEE NOTE AT END BEFORE REPLYING)
I made the mistake of combining:
If unable to notifiy user (screen saver running etc) - DENY action.
( I can't get into the Avast setup to figure out what the other setting was.)
The settings caused AVAST to put WinXP into ETERNAL BUSY during
boot up.
Condition was verified by setting avast processes to manual startup
using the system admin tools for services via SAFE MODE startup.
Until I did this, the machine would start loading up and then became
unresponive with the avast tray icon not showing the 'a' on the
icon...it looked more like a small blue ball with a white dot.
I need help ! How do I either restore the AVAST config file to defaults or change the flag for the above setting?
Help! Humans!

NOTE: !!!
I found out how to recover it... I manually restarted the
services after allowing WinXP to fully startup. Then I went
back into the advanced settings under "BLOCKER" and reset
it to allow actions if Avast is unable to ask for user input.
WOW! Sometimes I scare myself silly!
