Para usar el ultra iso y hacer un pen drive booteable con windows etc...

2. Using UltraISO, open the .ISO of Windows 7. The latest being 7100.0.090421-1700_x86fre_client_en-us_retail_ultimate-grc1culfrer_en_dvd.iso.
3. Click Bootable at the top and click Write Disk Image.
4. Select your preferred USB device. Leave the Write Method as USB-HDD+.
5 (optional). If you have not already done so, format the drive (bottom left of the Write Disk window) using whichever method you prefer. FAT32 and NTFS both seem to work.
6. Click Write. Be prepared to wait a while. Once it has finished, you now have a bootable drive. This can be used to boot into Windows 7 Ultimate install by any machine which has USB boot. It can also be used to perform upgrades from Windows XP/Vista etc.

Esa la use yo, hace poco cuando instale el win 7 en la net.
El tema que creo, que todas las pcs comunes, no tienen para bootear del usb. no se... al menos una que tengo yo, que es un mother low no tiene.


pd: Ultraiso ---> UltraISO - Descargar