About the codes.
General Troubleshooting.
UAC
Stop Windows from re-booting before you see the error code.
Reading the windows crash dump files.

In certain situations, drive virtualization software (software that lets you mount a disk image as if it were a physical drive, for example) will cause Windows Vista to reboot randomly. The effect is often reported to worsen over time and culminate in a Vista installation that enters a continuous restart cycle.