Requested registry access is not allowed, CR2008

Hi Guys,

I need your help, it does really make me sick.

I always get this kind of error:

Code:

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[SecurityException: Requested registry access is not allowed.]
  System.ThrowHelper.ThrowSecurityException(ExceptionResource resource) +51
  Microsoft.Win32.RegistryKey.OpenSubKey(String name, Boolean writable) +7462217
  Microsoft.Win32.RegistryKey.OpenSubKey(String name) +6
  CrystalDecisions.CrystalReports.Engine.ReportDocument.CheckForCrystalReportsRuntime() +149
  CrystalDecisions.CrystalReports.Engine.ReportDocument..cctor() +183

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I am trying to upgrade the web server from CR XI to CR 12. I have already installed to the server the CRRuntime_12_1_mlb.msi. But then I always get this error.

And sometimes the error is something like this:

Code:

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The type initializer for 'CrystalDecisions.CrystalReports.Engine.ReportDocument' threw an exception.

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