Installed Avast 4.8 Home Edition Demo version and Thunderbird doesn't start

I just installed Avast 4.8 Home Edition demo version and Thunderbird doesn’t start any more.
I’ve no idea what is going on???

I’ve started to scan files does it delete some of the thunderbird files?

I cehcked the chest and can’t see anything there.

I’ve disabled Avast but still can’t start Thunderbird.

Any idea what is going on???

Was you using AVG before that? Any other antivirus? Any other security program?
Which is your firewall?

yes McAfee
I don’t run firewall, its disabled. I disabled all firewall, windows Defender, McAfee AV etc but no luck.
I’m in Vista.

Disable is not enough (for McAfee antivirus).
This article provides the steps to remove SecurityCenter from your computer.
http://ts.mcafeehelp.com/faq3.asp?docid=71525
Also for direct download: http://download.mcafee.com/products/licensed/cust_support_patches/VSCleanupTool.exe
and http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe (2007)

Sometimes, McAfee won’t be completely removed if, before, you do not uninstall Avast, including the use of its “Uninstall Application” if necessary (www.avast.com/eng/faq-install-uninstall-avast.html).

I just solved it :wink:
I uninstalled Avast and install Thunderbird, I got all my inboxes.

McAfee is still there.

Anyway I’ll try to remove McAfee completely and try Avast.

Problem is I got Malware hidden somewhere and none of the AVs are able to find out. I found Avast recommended for it and that is why I just wanted to give it a go.

Ok. Download avast setup. Go off-line. Fully uninstall McAffe. Install avast. Go on-line again.