Cannot initialize SSPI package

Hi
Sometimes I have to restart the Web because the w3sp.dll w3core.dll crashes. Before the web server crashes, I always get, the following error. And I don't exactly know, how I can solve it.
Any help to solve this problem appreciated.
 I use as Database Server a MSSQL Express.

Cheers
Daniele

Event Type:    Warning
Event Source:    ASP.NET 2.0.50727.0
Event Category:    Web Event 
Event ID:    1309
Date:        13.08.2008
Time:        11:03:33
User:        N/A
Computer:    TALISKER-CHBS
Description:
Event code: 3005 
Event message: An unhandled exception has occurred. 

Event time: 8/13/2008 11:03:33 AM 

Event time (UTC): 8/13/2008 9:03:33 AM 

Event ID: 45d6ca04039c4cad8776c56825ec43e9 

Event sequence: 15 

Event occurrence: 7 

Event detail code: 0 
 
Application information:
Application domain: /LM/W3SVC/1/Root/FileExchange-2-128630915526875000 
    
Trust level: Full
Application Virtual Path: /FileExchange
Application Path: E:\wwwroot\FileExchange\ 
Machine name: TTEST-CHBS

Process information: 
    
Process ID: 1404
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: OleDbException
Exception message: Cannot initialize SSPI package 
 

Request information: 
    Request URL: http://www.myurl.com/fileexchange/Default.aspx
Request path: /fileexchange/Default.aspx 

User Host Adress: 126.246.4.6    
User:  
    
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE 
 

Thread information: 
    
Thread ID: 7 
    
Thread account name: NT AUTHORITY\NETWORK SERVICE 
    
Is impersonating: False 
    
Stack trace:    at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
   at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.OleDb.OleDbConnection.Open()
   at GleamTech.FileVista.OleDbDataManager.GetNumberOfEvents()
   at GleamTech.FileVista.OleDbDataManager..ctor(String connectionString)
   at GleamTech.FileVista.FileVistaApplication..cctor()
 
 
Custom event details: 

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Did you check the following article:
How to troubleshoot the "Cannot generate SSPI context" error message