The install media is actually not unique in any way. What makes your copy of windows unique is just the key. You can use any Vista disk (OEM, retail etc) to actually install the OS (32bit/64bit doesn't matter, the key will work for either). You can borrow a disk from a friend, or your neighborhood pc repair guy and use it. Ideally, it will be the same edition (Home basic, home premium, Pro) as the key on the sticker of your laptop. However, if it's not, that's really not a problem either. You can easily modify the disk to install any version of Windows Vista you need. See if you know someone with a Vista disk lying around.
To emphasize, as long as you use your own key to install the OS, everything is perfectly legal.