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How to Start/Stop
Microsoft.NET Framework NGEN
v2.0.50727_X86 service
Description Services Regedit Back CMD Msconfig
Service name: clr_optimization_v2.0.50727_32
Display name: Microsoft.NET Framework NGEN v2.0.50727_X86

Description:
Microsoft .NET Framework NGEN.

Path to executable:
C:\Windows\Microsoft.NET\Framework\v2.0.50727\mscorsvw.exe
Type services.msc and press Enter
Services.msc:
This method shows you how to Start/Stop Microsoft.NET Framework NGEN v2.0.50727_X86 from
Services.msc.
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Locate Microsoft.NET Framework NGEN v2.0.50727_X86 observe his current status and open to make
changes.
From General tab you can Start/Stop and change the Startup type of Microsoft.NET Framework NGEN
v2.0.50727_X86.
To finish press ok button and close Services window
Type regedit and press Enter
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Please navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\clr_optimization
_v2.0.50727_32
and locate Start registry key
Regedit:          
This method shows you how to change Startup type of Microsoft.NET Framework NGEN v2.0.50727_X86
from Registry Editor.
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
   
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

To Start Microsoft.NET Framework NGEN v2.0.50727_X86:

net start clr_optimization_v2.0.50727_32

Note: You can’t start a service if Startup type is on Disabled.

To Stop Microsoft.NET Framework NGEN v2.0.50727_X86:

net stop clr_optimization_v2.0.50727_32

To change Startup type:

Automatic:
REG add "HKLM\SYSTEM\CurrentControlSet\services\clr_optimization_v2.0.50727_32" /v Start /t REG_DWORD /d 2 /f

Manual:
REG add "HKLM\SYSTEM\CurrentControlSet\services\clr_optimization_v2.0.50727_32" /v Start /t REG_DWORD /d 3 /f

Disabled:
REG add "HKLM\SYSTEM\CurrentControlSet\services\clr_optimization_v2.0.50727_32" /v Start /t REG_DWORD /d 4 /f

Automatic (Delayed Start):
REG add "HKLM\SYSTEM\CurrentControlSet\services\clr_optimization_v2.0.50727_32" /v Start /t REG_DWORD /d 2 /f

Note: When you change to Automatic (Delayed Start) a new key DelayedAutostart is created with value 1.
REG add "HKLM\SYSTEM\CurrentControlSet\services\clr_optimization_v2.0.50727_32" /v DelayedAutostart /t REG_DWORD /d 1 /f

When you change to Automatic from Automatic (Delayed Start), DelayedAutostart change value to 0.
REG add "HKLM\SYSTEM\CurrentControlSet\services\clr_optimization_v2.0.50727_32" /v DelayedAutostart /t REG_DWORD /d 0 /f
CMD:          
This method shows you how to Start/Stop and change Startup type of Microsoft.NET Framework
NGEN v2.0.50727_X86 from Command Prompt
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Msconfig:          
This method shows you how to prevent Microsoft.NET Framework NGEN v2.0.50727_X86 service from
starting with the operating system using System Configuration (msconfig.exe)
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Write msconfig and press Enter
In System Configuration please go to Services tab and locate Microsoft.NET Framework NGEN
v2.0.50727_X86.
Uncheck the box to prevent this service to start and then press OK to finish.  
Any change make in System Configuration will be apply after restart.  
Up Back
   
   
Double click on Start and edit the value:

Change Startup type :

Automatic - 2
Manual - 3
Disabled - 4
Automatic (Delayed Start) - 2

Note: When you change to Automatic (Delayed Start) a new key DelayedAutostart is created with value 1.
When you change to Automatic from Automatic (Delayed Start), DelayedAutostart change value to 0.