windows vista home premium iso download?

i have a sony vaio running windows vista home premium, 32 bit, sp1.

my computer is beaing really silly and i want to re-install windows vista on it using a USB drive.
i am creating a install drive with this USB but i need a ISO file that i don't have.
where can i EASILY download the iso file from for FREE???

(i do NOT have the install disk and cant buy one right now.)

Hello Anibal, and welcome to Vista Forums.

The site below can help show you how to download and create a Vista ISO file for your edition. Afterwards, you could use the Windows 7 USB-DVD Download Tool to create a bootable DVD or USB flash drive with the ISO to do the repair install.

Microsoft: Vista Direct Download Links

Hope this helps,
Shawn