Impossible to reinstall & activate win, help please

An Optiplex 790 supplied w/win7pro. virus messed up so badly he had to erase and start over. He didn't restore factory disk. Media is long gone. I have the key # on the side. I tried a dozen ways to rebuild blocks of MS and it me at every turn. I was able to download win7 from MS, but not with an OEM key. I tried a win8 Dell another disc, but do not have the key. Were responsible for win7 but not activate a detail win7pro upgrade dvd and I have the key with this but he doesn't like it. Tried the key from another Dell supplied with win7. win10 downloaded, but he does not like any key I. don't want to order and wait days for Dell to send a new drive. Someone get out me of this rat maze before MS I'm going crazy. Please, I beg you.

Thank you.

Did you give a shot to the phone's toll-free activation service, although its toll-free number in Finland. I reinstalled Win 7 on several second hand Dell machines, and most of the time the OEM license on par with the machine key failed automatic activation.

Tags: Dell Software

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