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I'm using Dell Inspiron 1420 with Windows Vista Home premium. 2 weeks back installed Windows7 as dual boot on to my laptop. I installed it in a new way as my CD/DVD drive is not working. I extracted the Windows7 iso file into a folder and then double clicked on the setup file. The a series of dialogue boxes which pop up for normal installation appeared and done, I got Windows7 dual booted onto my laptop.

Now I'm trying to install Windows XP in the same way, as I don't want to use Vista due to compatibility reasons. But when I double click the setup file in the extracted iso, all the options except Install Win XP are working. I tried many times but the option is disabled. Please help me with this. I'm badly in need of XP. Thank you.

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Windows 7 has XP mode, why not use that instead of reinstalling XP?

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I forgot about that. – ChrisF Jul 1 '10 at 13:45
    
Works well, but you need enough memory installed for it to run well, 2gb. – Moab Jul 1 '10 at 14:44
    
With 3GB I can run 2 VM's while the dev environment is open too. It's well worth the memory. – invert Jul 9 '10 at 14:30

I've found this guide for installing XP after Windows 7 is already installed.

It means creating a second partition on your hard-drive to hold XP.

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