I have been having issues with IE8 on Win 7 x64 Ultimate freezing at random times. The entire system freezes and I must restart using the power button to recover. I have found in Win 7 event logs that each time this happens there are 2 entries about FF that appear. Those entries are:

Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: 4/15/2010 7:29:20 AM
Event ID: 6281
Task Category: System Integrity
Level: Information
Keywords: Audit Failure
User: N/A
Computer: Bobs-PC
Description:
Code Integrity determined that the page hashes of an image file are not valid. The file could be improperly signed without page hashes or corrupt due to unauthorized modification. The invalid hashes could indicate a potential disk device error.
File Name: \Device\HarddiskVolume2\Program Files\CheckPoint\ZAForceField\AK\icsak.dll
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
<EventID>6281</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12290</Task>
<Opcode>0</Opcode>
<Keywords>0x8010000000000000</Keywords>
<TimeCreated SystemTime="2010-04-15T13:29:20.509508100Z" />
<EventRecordID>6925</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="48" />
<Channel>Security</Channel>
<Computer>Bobs-PC</Computer>
<Security />
</System>
<EventData>
<Data Name="param1">\Device\HarddiskVolume2\Program Files\CheckPoint\ZAForceField\AK\icsak.dll</Data>
</EventData>
</Event>

and:

Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: 4/15/2010 7:29:20 AM
Event ID: 6281
Task Category: System Integrity
Level: Information
Keywords: Audit Failure
User: N/A
Computer: Bobs-PC
Description:
Code Integrity determined that the page hashes of an image file are not valid. The file could be improperly signed without page hashes or corrupt due to unauthorized modification. The invalid hashes could indicate a potential disk device error.
File Name: \Device\HarddiskVolume2\Program Files\CheckPoint\ZAForceField\Plugins\ISWSHEX.dll
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
<EventID>6281</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12290</Task>
<Opcode>0</Opcode>
<Keywords>0x8010000000000000</Keywords>
<TimeCreated SystemTime="2010-04-15T13:29:20.493908100Z" />
<EventRecordID>6924</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="48" />
<Channel>Security</Channel>
<Computer>Bobs-PC</Computer>
<Security />
</System>
<EventData>
<Data Name="param1">\Device\HarddiskVolume2\Program Files\CheckPoint\ZAForceField\Plugins\ISWSHEX.dll</Data>
</EventData>
</Event>

Other system details are as follows:

Zonealarm Extreme Security ver. 9.1.008.000
Antivirus/Antispyware version 8.0.2.42 DAT file ver. 1016011520
Antispam version 6.0.0.2385
Zonealarm ForceField 1.5.53.4

Can anyone help on this?

Thanks!