I had this problem last month. My mistake was that I had many PCs and I needed the same SCADA on each PC, so I cpoied/pasted the project. This caused WinCC to give me the user rights message.
The solution for this problem is to use the project duplicator found in Start->Programs->Simatic->WinCC->Tool->Project Duplicator
This will create a project saved on your local drive (not that you can't save directly on a networked PC or on a Flash drive)
You should take that project and copy it to the other PC.
When you open the WinCC project from WinCC expolrer, you should select to start the project locally and the you have to change the PC name and system parameters.
The more you know, The more you know you don't know