windows 7 or 8 downloads

Hello All,
I have acquired 4 dell OPTIPLEX computers from my company that they were not using anymore. Unfortunately, IT wiped the hard drives. Can anyone instruct me on how to load a cracked version of windows 7 or 8? I am not very computer savvy so I would require some detail in the instructions. Thanks in advance for any help that you can give me....

My friend,

you'll find anything you want on torrent sites. ie look at the piratebay:

https://thepiratebay.org/torrent/9175198/Windows_7_SP1_Ultimate_(64_Bit)

Windows 7 Service Pack 1 Ultimate 64 Bit

No Product Key Required!

Windows 7 Activation Is Included In The Torrent.

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or here, if you need 32bit version...

https://thepiratebay.org/torrent/10092032/Windows_7_SP1_Ultimate_(32_Bit)

Bits Service Pack 1 pryou'll find anything youo