hello Couch, and welcome to the vista forums,
The word Crash is such a generic term and may be used to describe all sorts of problems from an application freezing to a virus or such completely destroying your Vista installation.
vista will recover from a lot of "crashes" itself but of course not all.
The minimum that the manufacturer should have provided is a means of recovering your system to the state it was when it left the factory.
This may be in the form of a disk or set of disks or on a hidden part of the hard disk which can be accessed by a sequence of key presses when switching on.
Check the documentation that came with the computer to see if you can find instructions on System Recovery or similar.
If you cannot find this information please post back with the full details of the system you have [ manufacturer, model no etc, and I will try to advise further.