Upgraded to 7.0.1456 today and yet again upon rebooting I could not do anything from the desktop after logging in.
After a bit of experimentation it would appear that stopping Zonealarm from loading at startup will allow things to work (it can then be started once everything is up and running) but this certainly was not the case prior to the past weeks Avast updates.
I have checked Zonealarm version and it appears to be the latest
ZoneAlarm Free Firewall version: 10.1.101.000
vsmon version: 10.1.101.000
Driver version: 10.1.101.000
ZoneAlarm Browser Security: 1.5.380.0
ZoneAlarm ForceField Spyware Scanner: 1.5.53.235
ZoneAlarm ForceField Anti-Phishing Database: 1.2.104.0
ZoneAlarm ForceField Spyware Sites Database: 04.155
So I would suggest that Avast is still causing issues for me on my Windows XP Pro machines