hello, with simple ' ' it works. thanks a lot but i have another question. the variable %cdrom% stand for first drive in the computer. but at most installs my cdrom is not at the first drive.so the install fails with the mars installer. at the marsinst.ini what have i to edit, so that mars installer even have the right drive letter? this is my current config: [Options] Root=%CDROM%\Software ; main root folder for installations, use it as %ROOT%, %BDRV% is drive letter where marsinst.exe is FindCD=XP32\DISK101 ; finds file on all available CD-ROM drives and if found set %CDROM% variable to that drive's letter could i change the FindCD to: FindCD=win51ip.SP2 ?So mars installer should find this file at my windows cd and sets the drive letter from this cd to mars installer. is that right? ciao