Sometimes it happens that few extensions or addons that you install ion Visual Studio 2010 might cause some error . These error might be because of the extensions that are not coded well .
Incase you dont identify which extension is causing the error , but want to disable all the extension together , then try using the Visual Studo 2010 in safe mode .
To run the visual studio in safe mode , type devenv.exe /safemode in the run window .
This will open the Visual Studio 2010 in safe mode thus disablling all the extensions .