Run Installations From Cd/dvd

[GreenMachine]

I believe what is really being looked for in 99% of these cases is the cd letter from which windows was installed: that is where the CD is ...

FOR /F "TOKENS=3" %%I IN ('REG QUERY "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v "SourcePath" ^| FINDSTR "SourcePath"') DO SET CDROM=%%~dI

Neater, and more efficient ...