I never updated from 4.8 on my XP desktop because of the problems that I had read about on this forum. Have all the problems been fixed? I would really like to put it on this machine too.
For XP, I would recommend doing a
clean install from 4.8 to 5.0.594. This seems to have resolved the issues you have heard about.
1. Save a copy of newest version of Avast (5.0.594) for the version you need and save it to your HDD:
Free –
http://files.avast.com/iavs5x/setup_av_free.exe Pro –
http://files.avast.com/iavs5x/setup_av_pro.exeAIS –
http://files.avast.com/iavs5x/setup_ais.exe 2. Download the Avast Uninstall Utility, aswClear5.exe
http://www.avast.com/uninstall-utility and save it to your HDD (it has uninstall tools for both 4.0 and 5.0).
3. Disconnect from the Internet at this time.
4. Uninstall Avast through "Add/Remove Programs" through Control Panel.
5. Boot into
Safe Mode (hit F8 repeatedly) and run the Avast Uninstall Tool.
6.
Reboot twice.
7. Clean your computer up (clean up cache, temporary Internet files, etc.).
8. Install the newest version of Avast and
reboot.
9. Get Internet access and update Avast definitions.
10. Register your copy or add the license key for Free, Pro, or AIS.
Let us know how this works out for you.