Here is rampant error I have seen after applying Windows Updates:
Event Type: Error
Event Source: .NET Runtime Optimization Service
Event Category: None
Event ID: 1103
Time: 8:24:21 AM
.NET Runtime Optimization Service (clr_optimization_v2.0.50727_32) - Tried to start a service that wasn't the latest version of CLR Optimization service. Will shutdown
Fixed it this way:
1. Run NDP20SP2-KB974417-x86.exe -X
2. In the “choose directory” box, enter “C:\kb974417” (whatever you want to name it)
3. Then go to C:\kb974417, using explorer
4. Doubleclick the file NDP20SP2-KB974417.msp to install
5. Reboot your computer.
If you are using Windows Update server, you might have to reset:
At command prompt: wuauclt.exe /detectnow
Got to love updates!