>>I installed Vista on a laptop that was little used at the time and now want to go back to XP. The laptop is now in regular use and we are having trouble getting it to work amiably with the other computers in the house, both of which are running XP. There doesn't seem to be anything built into Vista that will let you revert to XP, which it was running before. I tried booting from an XP Pro installation CD but the setup program was blocked by Vista. I even tried formatting the laptop's C: drive. No luck.
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>>Is there any way to do this?
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>I couldn't success that too. I you can do it please let me know... :)
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>I think so if we can find a low level format utility, we can do it... I'm aware these things from years... :(

How can vista block the setup program when vista is even running? I have done this successfully in the past. I installed the vista ctp on my old laptop to see if it would run on it. No problems, it ran fine on a 7 year old laptop. Then I simply reinstalled xp. Again no trouble. You must be doing something wrong.

1. Boot from the xp cd
2. delete the partition and reformat
3. reinstall xp.