@Miked
If your version of Vista is either business or ultimate you can downgrade to XP. You have to call Microsoft to activate XP on your system and let them know you want to exercise your downgrade rights.
You will have to give them your code from Vista so have it handy.
The other option is to do what JJ said and find a windows XP CD(preferably with SP2) for a Dell computer and install it that way.
