A possible reason could be if during the installation the VSExtensions fail to install properly. If you use Visual Studio 2010, you could check whether you have the extensions through Tools -> Extension Manager.
Also this problem might have happened because the Telerik.Web.UI.VSPackage (part of the VSExtensions) failed to load properly, so could you please try the following:
- Start a Visual Studio Command Prompt (Start menu -> Microsoft Visual Studio 20xx -> Visual Studio Tools -> Visual Studio 20xx Command Prompt);
- run devenv.exe /resetskippkgs;
- Watch for a possible error during the Visual Studio startup and check the Telerik menu;
Please let me know if that helps.
All the best,
the Telerik team
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