系统环境变量(path)里面是:C:\MentorGraphics\9.2PADS\SDD_HOME\common\win32\bin;C:\MentorGraphics\9.2PADS\SDD_HOME\common\win32\lib;C:\Program Files\Common Files\Microsoft Shared\Windows Live;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\Windows Live\Shared;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\MentorGraphics\9.2PADS\SDD_HOME\CAMCAD;%MGC_HOME%/bin;%MGC_HOME%/lib;%MGC_HOMEBS%\bin;%MGC_HOMEBS%\lib;;C:\Program Files\9158KTV\9158VirtualCamera\Package\bpl;C:\Program Files\9158KTV\9158VirtualCamera\bin;C:\Program Files\9158VirtualCamera\bin;%CDSROOT%\tools\bin;%CDSROOT%\tools\libutil\bin;%CDSROOT%\tools\fet\bin;%CDSROOT%\tools\pcb\bin;%CDSROOT%\tools\specctra\bin;%CDSROOT%\tools\PSpice;%CDSROOT%\tools\PSpice\Library;%CDSROOT%\tools\Capture;%CDSROOT%\OpenAccess\bin\win32\opt,该如何设置呢?