Most likely it's a driver or hardware related error. See: http://www.google.com/search?q=vista+stop+7e http://www.google.com/search?q=vista+stop+0x0000007e.

If you get it also after booting from the Vista DVD (that includes knowing that you really boot from it, not just put the DVD in and still boot from the hard disk, which can happen if the BIOS is set to boot from the HD first) it uses the drivers from the DVD, and that proves that it's a hardware issue.

Remove everything you can (like sound card, USB-card, firewire card, all USB-connected devices, all RAM-sticks but one) and try again. If the problems persist it's a hardware error in an essential component (motherboard, remaining RAM, CPU, hard disk). Then it's time to visit the repair shop.

Kees