Odd Visual studios error on run in browser

Hey all, I have an odd error I need advise on, I installed the latest version of Visual studios professional edition a few days ago, the default project worked fine the first time but ever since then I've had this error every time I run any website, including the default not changed template and a blank hello world website.

Server Error in '/' Application.

Specified argument was out of the range of valid values.
Parameter name: site

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: site

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: site]
   System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +298

[HttpException (0x80004005): Specified argument was out of the range of valid values.
Parameter name: site]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9873912
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.17929

Any suggestions? any google searching I did came up with generic errors which weren't related to this problem.

The error happens on all browsers too, although the first time it ran it worked on chrome

Tags: C#, Errors