Rufus software redhat enterprise 5 and many other linux iso files are used to make pen drive bootable. This software is free, you can download it from the link given below. From this software today I will send you an ISO file from redhat 5 Make pen drive bootable and show that if you want to know the installation of redhat 5 you can know by clicking this link click here :- arvindlinuxweb
You can download rufus software from here Download Rufus
Before you make pen drive bootable, you have to convert your pen drive into FAT32
According to the image given below in this manner
Firstly, by right-clicking on the pen drive, choose the format option and then select NTFS instead of FAT32 and format