Win 7 crashes (locks up) in Flight Sim .

BODY{font:x-small 'Verdana';margin-right:1.5em} .c{cursor:hand} .b{color:red;font-family:'Courier New';font-weight:bold;text-decoration:none} .e{margin-left:1em;text-indent:-1em;margin-right:1em} .k{margin-left:1em;text-indent:-1em;margin-right:1em} .t{color:#990000} .xt{color:#990099} .ns{color:red} .dt{color:green} .m{color:blue} .tx{font-weight:bold} .db{text-indent:0px;margin-left:1em;margin-top:0px;margin-bottom:0px;padding-left:.3em;border-left:1px solid #CCCCCC;font:small Courier} .di{font:small Courier} .d{color:blue} .pi{color:blue} .cb{text-indent:0px;margin-left:1em;margin-top:0px;margin-bottom:0px;padding-left:.3em;font:small Courier;color:#888888} .ci{font:small Courier;color:#888888} PRE{margin:0px;display:inline} - <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-CAPI2" Guid="{5bbca4a8-b209-48dc-a8c7-b23d3e5216fb}" EventSourceName="Microsoft-Windows-CAPI2" />

<EventID Qualifiers="0">4107</EventID>

<Version>0</Version>

<Level>2</Level>

<Task>0</Task>

<Opcode>0</Opcode>

<Keywords>0x8080000000000000</Keywords>

<TimeCreated SystemTime="2010-08-07T15:10:59.603293300Z" />

<EventRecordID>16517</EventRecordID>

<Correlation />

<Execution ProcessID="1128" ThreadID="1980" />

<Channel>Application</Channel>

<Computer>scott-PC</Computer>

<Security />

</System>


- <EventData>
<Data>http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab</Data>

<Data>A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.</Data>

</EventData>


</Event>

Any help? Thanks

When flying in FS9,the air traffic control voices sometime have a sound like a 'zzzzz' or a stuttering of their voice. Then sometimes the screen will lock up.And the sound will keep looping. Control-Alt-Delete does nothing,now does ESC. I have to Press the power button on the PC and restart windows.
I read up on this,and I use the Windows Event Finds,and I see I got this error with a red (!);

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-CAPI2" Guid="{5bbca4a8-b209-48dc-a8c7-b23d3e5216fb}" EventSourceName="Microsoft-Windows-CAPI2" />
<EventID Qualifiers="0">4107</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8080000000000000</Keywords>
<TimeCreated SystemTime="2010-08-07T15:10:59.603293300Z" />
<EventRecordID>16517</EventRecordID>
<Correlation />
<Execution ProcessID="1128" ThreadID="1980" />
<Channel>Application</Channel>
<Computer>scott-PC</Computer>
<Security />
</System>
- <EventData>
<Data>http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab</Data>
<Data>A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.</Data>
</EventData>
</Event>