How do I install Windows XP on a computer with Vista, I want to have both installed at the same time.?

If you do a simple google search for

dual boot xp and vista

you will find a ton of info on how to do that

http://www.google.com/search?hl=en&source=hp&q=dual+boot+xp+and+vista&aq=f&oq=&aqi=g10

I run 4 OS’ including XP Pro and Vista. You need to put XP on first, then ater installing XP, Install Vista and it will set up a boot menu screen so when you boot up it will ask which version to boot to. Honestly, you should consider 7. It’s faster, more stable and a lot less hassles.

Keep in mind, you need a separate drive or drive partition for each OS.

http://lifehacker.com/5126781/how-to-dual-boot-windows-7-with-xp-or-vista

That talks about windows 7 but it’s the same process.

The process is called dual-booting and the full list of steps is probably a little long to post here.

Instead check out (the original url was too long to display here):
http://tinyurl.com/33hnmr

that’s a great detailed guide with plenty of pictures and information all the way from partitioning to installing and configuring to dual boot.

Hey…
you have to install your win xp in a separate partition……when set up asks for the partition to which it is to be installed….don’t select C drive…..rather choose a different one……then on booting you will be asked…
Which OS you want to open…..
ans thats it….
Well don’t forget to back up your data….for security reasons……use a good back up utility…..

You have to have 2 or more drives to do dual boot. either partition (separate) your C drive or get another hard drive. one OS one drive.

you can partition by, right clicking my computer->manage->storage->disk management or get a partitioning software online.

make sure you allocate enough space (min 1.5GB) in the new drive.
insert xp cd and install in the new drive. taDa and you’re done