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Go into your files, go to program files, click the one that says iTunes, and delete the entire folder. Go to the Apple site and re-download it. It should open. If that doesn't work, try pressing CTRL, ALT...

If you want lean and fast, you go with linux. If you want easy and comfortable (with a decidedly slower performance) you go with windows. It really depends on which software packages you want to run. I.e.which game servers, etc.

... it an OEM branded (HP/Compaq/Acer/Dell/HP), or Retail? Your key would only work on the version it ...

No such thing exists at this point. Microsoft has given up on that market after multiple high-profile failures.

Unless you had automatic back-ups running (from which you could restore) your file is effectively gone. The only way to get it back, and it's doubtful, is to stop using the computer and by using a recovery program and searching for...

... and treat the disk as a blank disk so start from scratch - dells may have disk diags that do that for you otherwise Seagate...

7zip can extract files from a wim.

... the hard drive. Make sure you have all the correct drivers from Dell site first, unless you are using their reinstall media...