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Sadly the logs doesn't say anything.

But you are able to start the game and play for while(i.e. not crash at startup)?

If you are somewhat computer savvy, could you please press the windows button + 'r' and type "eventvwr" and press enter. This should start the event viewer application.

In this application, select "windows logs"->"application". Can you find anything here about ck2.exe?
 
I'm in the same situation ; here is the application error event information I retrieved from the event viewer :

Log Name: Application
Source: Application Error
Date: 15/02/2012 14:13:39
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Vincent-PC
Description:
Faulting application name: ck2.exe, version: 1.0.0.0, time stamp: 0x4f394106
Faulting module name: nvd3dum.dll, version: 8.16.11.8766, time stamp: 0x4ac796a4
Exception code: 0xc0000005
Fault offset: 0x003a96cb
Faulting process id: 0x784
Faulting application start time: 0x01ccebdf228de387
Faulting application path: C:\Paradox\Crusader Kings II\ck2.exe
Faulting module path: C:\Windows\system32\nvd3dum.dll
Report Id: df7abf34-57d6-11e1-ba23-00238b7f61c6
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-02-15T13:13:39.000000000Z" />
<EventRecordID>23511</EventRecordID>
<Channel>Application</Channel>
<Computer>Vincent-PC</Computer>
<Security />
</System>
<EventData>
<Data>ck2.exe</Data>
<Data>1.0.0.0</Data>
<Data>4f394106</Data>
<Data>nvd3dum.dll</Data>
<Data>8.16.11.8766</Data>
<Data>4ac796a4</Data>
<Data>c0000005</Data>
<Data>003a96cb</Data>
<Data>784</Data>
<Data>01ccebdf228de387</Data>
<Data>C:\Paradox\Crusader Kings II\ck2.exe</Data>
<Data>C:\Windows\system32\nvd3dum.dll</Data>
<Data>df7abf34-57d6-11e1-ba23-00238b7f61c6</Data>
</EventData>
</Event>

Please upload a dxdiag
 
I'm also getting a CTD during playing the game. It keeps happening at a similar point when I reload the last autosave. The application error from the event viewer is:

Log Name: Application
Source: Application Error
Date: 15/02/2012 15:39:26
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Dan-PC
Description:
Faulting application name: ck2.exe, version: 1.0.0.0, time stamp: 0x4f394106
Faulting module name: ck2.exe, version: 1.0.0.0, time stamp: 0x4f394106
Exception code: 0xc0000005
Fault offset: 0x000d2413
Faulting process id: 0x8f0
Faulting application start time: 0x01ccebf737ef6264
Faulting application path: G:\Paradox Interactive\Crusader Kings II\ck2.exe
Faulting module path: G:\Paradox Interactive\Crusader Kings II\ck2.exe
Report Id: 3d79ffa5-57eb-11e1-b162-d027881c4322
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-02-15T15:39:26.000000000Z" />
<EventRecordID>32784</EventRecordID>
<Channel>Application</Channel>
<Computer>Dan-PC</Computer>
<Security />
</System>
<EventData>
<Data>ck2.exe</Data>
<Data>1.0.0.0</Data>
<Data>4f394106</Data>
<Data>ck2.exe</Data>
<Data>1.0.0.0</Data>
<Data>4f394106</Data>
<Data>c0000005</Data>
<Data>000d2413</Data>
<Data>8f0</Data>
<Data>01ccebf737ef6264</Data>
<Data>G:\Paradox Interactive\Crusader Kings II\ck2.exe</Data>
<Data>G:\Paradox Interactive\Crusader Kings II\ck2.exe</Data>
<Data>3d79ffa5-57eb-11e1-b162-d027881c4322</Data>
</EventData>
</Event>


Let me know if you need any more info.

Have you tried the suggested fixes in this thread?

http://forum.paradoxplaza.com/forum/showthread.php?585417-crash-when-loading-save-games

If yes and it still doesn't work, please upload your savegame