It seems that you there is an issue with permissions.
I recommend checking the following:
- Check your user account - is it an administrator or an ordinary user.
- Check the rights of the folder where you are developing your project. I suggest trying to develop it in the My Documents folder and checking if the problem persist.
- Ensure that Visual Studio and our controls are installed using the administrative account.
I hope this helps. If you have additional questions, do not hesitate to contact me.
the Telerik team