Firefox - ZoneAlarm Issue

[iulic]

Description of the problem:
After using Firefox for a long time (including pauses when the computer entes in stand by), Firefox stops loading pages. Practicly internet connection hangs. I close the browser, but it is still running as a process. I can't force closing and can't shutdown the computer (nothing hapends when I click shutdown). After closing ZA Free the computer enters in the log off state, and it shuts down after about 3-4 minutes.

Computer:
1. Windows Vista Premium 32 bit SP2 updated
2. AVG Antivirus Free Edition ver. 9.0.704, link scanner disabled
3. Mozilla Firefox 3.5.5 (no add-ons)
2. ZoneAlarm Free
ZoneAlarm version:8.0.298.000
TrueVector version:8.0.298.000
Driver version:8.0.298.000
Internet Zone Security high
Trusted Zone Security medium
Networking (LAN and Wireless LAN adaptors) Internet zone
DHCP Server and DNS servers on Trusted zone
Program Control medium
Automatic Internet Lock disabled
Program control: Firefox access allowed, server ask first

There is also a discution on the Mozilla forum, but it seams that I have to uninstall one of them (FF or ZA).
http://support.mozilla.com/tiki-view...entStyle_plain

Frankly, I don't want to chose between the two software. Please try to give me a solution.