I have another way but not using INF file actually I am using it to install all my apps ....... First: Put this line in the beginning of you RunOnceEx File for %%i in (D: E: F: G: H: I: J: K: L: M: N: O: P: Q: R: S: T: U: V: W: X: Y: Z: ) do if exist %%i\CD.txt set CDROM=%%i Second: You must make text file named “CD.txt” and put it in your DVD root Third: Replace the CD ROM drive Litter With “%CDROM%” in all paths that refer to your DVD don’t forget the percentage marks Ex. %CDROM%\SW\ICQ.exe I hope I was helpful