Nowadays, virtualization is a solution which is interested by many IT manager. By converting existing system to virtual, you can save lot of money from buying new hardware every year, avoid hardware conflicts when you move virtual to another computer, etc. But when you convert system to virtual, you still need OS to run virtual software (VMWare, Virtual PC, etc).
When you use virtualization software such as Microsoft Virtual PC, VMWare, etc. Most of the time, you’ll duplicate (copy and paste) Windows virtual disk for creating a new system instead of grab a Windows CD and install it from scratch because it’s really fast and simple. But the problem occured on the duplicated disk that it contains the same Computer Security Identifier (SID) with the original so that if you try to join the domain on the new system, you can’t login to the domain and the error message show as below
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