Create symlink with Web Application using IIS 7.5

I want to create symlinks with a web application which is running in IIS 7.5. However during the creation the following error message appears:

A required privilege is not held by the client. (Exception from HRESULT: 0x80070522)
System.Runtime.InteropServices.COMException (0x80070522): A required privilege is not held by the client. (Exception from HRESULT: 0x80070522) at 
System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtrerrorInfo) at Uploader.SaveToDisk()

I have modified the "Local Policies / User Rights Assignment / Create symbolic links" to Everyone with secpol.msc but this modification didn't solve the problem.

Does anyone have encountered the same problem before or has any advice where to look for?

I solved this issue by changing the user used by IIS for Anonymous Authentication from IUSR to a user in the Administrators group.

To change this go to IIS / Authentication / Anonymous Authentication / Edit

I did this on my development machine. This is probably not the way to do it on a production server.