I installed SP1 for .Net 2.0 and .Net 3.0 on my test SBS server. Upon rebooting, I was getting a lot of Event Id 1101 .NET Runtime Optimization Error messages.
Event Type: Error
Event Source: .NET Runtime Optimization Service
Event Category: None
Event ID: 1101
Time: 2:00:48 AM
.NET Runtime Optimization Service (clr_optimization_v2.0.50727_32) – Failed to compile: Microsoft.ReportingServices.QueryDesigners, Version=188.8.131.52, Culture=neutral, PublicKeyToken=89845dcd8080cc91 . Error code = 0x80070002
If the errors doesn’t go away, go into Add/Remove Programs and run a repair on Microsoft Report Viewer Redistributable 2005. This has helped in some cases in clearing the problem.