On the server where CRM 2011 is installed I get the event error entry:
Event 1026, .NET Runtime
Application: CrmUnzipService.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Stack: at Microsoft.Crm.Unzip.UnzipService.OnStartInternal
at ...Run(..)
at ...QueueUserWorkItemCallback...
at ...ThreadPoolWorkQueue.Dispatch()
at ...PerformWaitCallback()