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You can also save a Macrium backup image (or Acronis if you have WD or Seagate HD as it comes free) and run an in-place Upgrade to Win7 since these restrict you from a Clean Reinstall until you replace them. https://www.sevenforums.com/software/...e-macrium.html
A simple guide to a successful in-place upgrade
Almost any installer can be found online with a search. It's not illegal to use a torrent if you own the program with a Product Key. Just be sure to get a clean copy without a crack which will trigger AV and is illegal.
What Office do you have? There are public links on Dell's site to Office 2010.