unfortunately, every manufacturer does it a different way.

it's a pet peeve of mine that they don't distribute the disks for recovery, though you can buy a recovery disk for about $25-$40. The ibm/lenovo brands have a "recovery partition", which if you need to rebuild, then you hit F11 during the startup before windows starts, and it rebuilds the computer back to the way it comes from the factory. Ok for that, but if the hard drives kacks, then you're SOL.

You'll find that the manufacturer loaded all sorts of specific "branded" shortcuts all over your desktop probably, one of those
should have a shortcut to a utility to create your recovery disks. It will probably take a couple of CDs or a single DVD. It should be labeled something like "system disk utility" or "backup disks" or "create recovery disks".
If it's not on the desktop, then it should be under START --> PROGRAMS --> ALL PROGRAMS --> [manufacturer name] TOOLS (or UTILITIES).
Sorry, I know that's not much help, but I've only installed Vista off raw media so far, i haven't come across and preloaded systems.