Tvoj problem je ze preskakujes v navode veci a necitas release notes u toho co tahas
What OSes can I run Convert-WindowsImage on?
Convert-WindowsImage can only be run on Windows 8 Consumer Preview, Windows 8 Release Preview, Windows Server 8 Beta, and Windows Server 2012 Release Candidate operating systems. Convert-WindowsImage cannot be run on Windows 7 or Windows Server 2008 R2.