OK... first of my english is not that good so im going to explain this as simple as possible..
first of download the trial version of Ultra ISO found here (( http://www.ezbsystems.com/ultraiso ))
Then after u install this program open it... click on open look for your windows XP,Vista or 7 ISO file (depending on the size of the ISO file is the size on the USB flash drive u should get windows XP works on a 1GB, Vista should be on a 8 GB and windows 7 fits on a 4 GB...
After you have open the iso in the program just click on the top where it says bootable,
choose the one that says ((write image))
then a pop out window should appear choose your USB flash drive remember it should be empty if anything is on it, it will get erased.. check mark on the verify after writing..
this should take like 15 minutes an then your set to boot up from the USB
hope this is better then more complicated version... work for me
