If you installed Visual Studio 2012 and updated VS2012 to latest version : and Your unable to connect to SharePoint 2013 installed on the computer. Following the instructions can resolve the issue
Possible Errors messages displayed
SharePoint Server not installed.
- Download officetools_bundle from this direct link http://go.microsoft.com/fwlink/?LinkID=279063&clcid=0x409
- Run the setup and allow it to complete.
- Open visual studio 2012 and enjoy developing apps for SP 2013.