Computer laptop Windows 7 had XP loaded on it how do I change it back to windows 7

One of the Windows 7 laptop computer employees previous were Windows XP loaded on it, how do I change to Windows 7.

I am told that we have no disc as came preloaded?

How to uninstall Windows 7:
http://support.Microsoft.com/kb/971762

How to uninstall Windows 7 by using the Windows.old folder:
http://support.Microsoft.com/kb/971760

Tags: Windows

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