USB booting :: usb boot advice

Is to advice or to learn a silly answer , i´m new in linux.

I make a bootable pendrive,in the work, with a new pc with bios option of boot with a pendrive, installation of live cd and ok.. these pc begin to work with the dsl in pendrive.

In home i put the pendrive in the old pc,(with no bios option of boot with a pendrive only usb-cdrom), with dsl in the hard disk and begin to boot but in a steep said "restoring backup files sda1" in blue, and put the old pc with screen resolution of the new pc and hanging the pc, i switch off the pendrive and rebot and now the old pc said invalid device sda1 and hanging now...

Solution for people new in dsl . Easy... turn to install dsl on hard drive in 10 minutes , dsl is the fasted distro to install that i have seen.

If there is another solution post it thanks..