If I upgrade to Vista, dose XP remain available. Can I revert back if I want ?
No assumiong you have an OEM copy of your XP, unless you have a Dual Boot set up. You could of course "image" XP eg with Acronis and go back that way.
Dual boot. click here
I have an external HD. Can I install Vista there?
Others may help you here but I think it can be done in limited circumstances but it is not recommended.
Thanks. its too complicated and risky. Rgds.
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