Installed Avast! Now Thunderbird Does Not Work

I have been using Thunderbird for a while now and everything was working fine. I have recently installed Avast! home edition and now Thunderbird can not launch or check e-mails. As a matter of fact, I can not launch programs like Yahoo! Messenger and Excel from my desktop (double click the icons). Any idea on what is going on? I am using Win XP SP2, Firefox, and Thunderbird.

Very new to Avast! as well.

Thanks.

Did you change avast! settings? Which ones?
If you uninstall, boot, install again, boot again, will the problem be solved?

Are you using any other antivirus in this computer?
Which firewall do you use?

I did not change any settings in Avast!. I have not tried the unistall routine but can try it tonight.

I am not running anyother antivirus software - uninstalled Norton Internet Security before installing Avast!. So far, I’ve noticed the following:

(1) Thunderbird will not launch completely. Screen stays grayed out. No graphics.
(2) Yahoo! Messenger will not launch at all. Hour glass will spin but eventually stops without launching.
(3) I use Open Office which is an open source mimic of Microsoft Office. None of those applications will launch either.

I did briefly disable Avast! and tried launching some of the above but without success. Is there a filter in Advast! that is blocking these applications?

Mike

Norton (if installed as part of the NIS suite) is a real pain in the rear to get rid of, as many posts in these forums attest to, even after an uninstall.

A link worth looking at, which is a program removal tool that can remove the remnants of a number of different Norton Programs:
Removing your Norton program using SymNRT, download and run the utility and reboot. Then do the Uninstall Install routine Tech mentioned.

Seems a driver level conflict… Did you use any antivirus in the past? Norton Antivirus was installed with Norton Internet Security?

No Mike, avast is an antivirus…
This is the behavior of a conflict…