sure, place a file on your hdd (for example ill use win51ip.SP2 @ECHO OFF IF EXIST C:\win51ip.SP2 set HDD=C: IF EXIST D:\win51ip.SP2 set HDD=D: IF EXIST E:\win51ip.SP2 set HDD=E: IF EXIST F:\win51ip.SP2 set HDD=F: IF EXIST G:\win51ip.SP2 set HDD=G: IF EXIST H:\win51ip.SP2 set HDD=H: IF EXIST I:\win51ip.SP2 set HDD=I: IF EXIST J:\win51ip.SP2 set HDD=J: IF EXIST K:\win51ip.SP2 set HDD=K: IF EXIST L:\win51ip.SP2 set HDD=L: IF EXIST M:\win51ip.SP2 set HDD=M: IF EXIST N:\win51ip.SP2 set HDD=N: IF EXIST O:\win51ip.SP2 set HDD=O: IF EXIST P:\win51ip.SP2 set HDD=P: IF EXIST Q:\win51ip.SP2 set HDD=Q: IF EXIST R:\win51ip.SP2 set HDD=R: IF EXIST S:\win51ip.SP2 set HDD=S: IF EXIST T:\win51ip.SP2 set HDD=T: IF EXIST U:\win51ip.SP2 set HDD=U: IF EXIST V:\win51ip.SP2 set HDD=V: IF EXIST W:\win51ip.SP2 set HDD=W: IF EXIST X:\win51ip.SP2 set HDD=X: IF EXIST Y:\win51ip.SP2 set HDD=Y: IF EXIST Z:\win51ip.SP2 set HDD=Z: start /wait %HDD%\Install\program.exe /switch same as calling it from cd & the PE question has been asked, look in the PE forum