Why did we use "[if exist" there? Should it be "if exist"? What is the difference between "if exist" and "[if exist"? ALSO I still couldn't do UNATTENDED This is my 14th hours. I did several ways, several modifies but nothing changed. Do you think why I couldn't it? Which file is calling "WINNT.SIF" file? Maybe that file is broken so WINNT.SIF couldn't calling from system. EDIT: I don't have: and This can be problem? FINALLY, I FOUND WHERE THE PROBLEM IS: This way is completely useless for my bootdisk: Main idea is this: When you copy and renamed like PRO2 and PRO2.DAT, PRO2.DAT don't see "PRO2", it still see "PRO1". So that, if you want to create a UNATTENDED version, you have to do same things like doing in PRO1. I mean you have to use Create_boot_folders.cmd for PRO2 too. Thanks to andreqcasal again for this greate guide.