Category não é uma opção do MSInfo32 em versões do Windows mais recentes que o XP.
De Como usar as chaves de linha de comando de Informações do Sistema (MSINFO32) :
• Some command-line switches available for Windows XP are no longer supported in Windows Vista or in Windows 7.
Existem apenas três opções de linha de comando MSInfo32 válidas no Windows Vista +:
Command options that are supported in Windows 7, Windows Vista and Windows XP
/nfo {Path} Saves the exported file as an .nfo file. If the file name that is specified in Path does not end in .nfo, an .nfo file name extension will be appended to the file name.
/report {Path} Saves the file that is specified in Path in the .txt format. The file name will be saved exactly as it appears in path. The .txt file name extension will not be appended to the file unless it is specified in Path.
/computer {ComputerName} Starts System Information for the specified remote computer. Note When you connect to a remote computer, you must have appropriate permissions to access WMI on the remote computer.