Can't install Avast home edition..

i get this message :

’ There was an error while changing product configuration’.

i have vista home(32), 2G, 300G hd

i dont have any old version installed.

Did you try avast before (trial version)?
Did you have any other antivirus in the computer in the past? How did you remove it?

yeah…i had mccafee that came with computer. used add/remove to take it out.

i also ccleaner to clean up the registry.

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)

If you need, you can find many free versions of these registry cleaners here:
http://www.snapfiles.com/Freeware/system/fwregtools.html

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).

If you need, you can find many free versions of these registry cleaners here: http://www.snapfiles.com/Freeware/system/fwregtools.html
I like and use RegSeeker followed by NTREGOPT and reboot: http://www.hoverdesk.net/freeware.htm http://www.larshederer.homepage.t-online.de/erunt

I use the Histories … Old Start Menu items and Clean StreamMRU/Stream keys and after few days I delete the Backups.