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Re-install of Win 7 (custom) over already installated version

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Could very well be a daft question, nevertheless here goes

I have a dell desktop PC (XPS420) and the previous OS was Vista Home Premium. I acquired a copy of the new Win 7 disc and did a custom installation (clean install I hoped) which I am of the opinion should have also formated my C: drive. Is that correct?
Having completed the installation I now find that all is not working as expected. e.g. I find a folder c:\windows.old which on examining contains data which were previously files from my old operating system. Very confusing.
I would like to reinstall and wonder if it is possible. Can anyone advice as to whether it is possible to another clean install (custom) and is it possible to do so in an effort to get rid of all previously files .

Tks for your advice in advance and hopefully you can guide me correctly to acquire a completely clean C: drive completely rid of all previously installed old data.


P.S. Is there anywhere I can find a list of compatibile software which are compatible with WIn 7.
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Those files in windows.old are your old operating system files. If you look in the users folder inside that, then your username folder e.g Users > Fred then you will find all of your old documents and downloads and desktop files. it is safe to delete the windows folder inside windows.old. Your programs from your old operating system can be found in the Program Files folder inside windows.old

Why do you want to re-install windows again?

Edit, once you have moved your documents out of windows.old, you can safely delete the whole windows.old folder, as it is now useless. 99% of vista software is compatible with Windows 7

Edited by Normanings, 12 November 2009 - 04:29 AM.

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