Visual studio encounters an unexpected exception while creating a new webuser control in an ASP.NET website

I encounter this message when I try to add a  web user control to an asp.net website. To accomplish this I do the following steps
1)I create a new ASP.NET website 
2)I add a new web user control by using the solution explorer i.e right clicking on the application directory and adding a new item
after creating any control such as asp:Label with ID and runat="server" attributes
When I type &nbsp in the .ascx file for the web user control. I get the following dialog box
Visual Studio has encountered an exception. This may be caused by an extension.
You can get more information by running the application together with the /log parameter on the command line, and then examining the file 'C:\Users\Suraj\AppData\Roaming\Microsoft\VisualStudio\10.0\ActivityLog.xml'.
I am using Visual studio 2010 ultimate trial alongside VS2010 express editions both have been updated with Service Pack1 for Visual Studio
how to resol ...