Windows 10: Can my old Dell PC upgrade to Windows 7,8, or 10

I have a Dell Optiplex 745 pc. It is currently running on Windows XP It has an Intel PentiumR Dual CPU E2140 1.60GHz processor. I have only 1 GB of installed memory.I'm wondering if I can update the Windows version to Windows 7,8, or 10.Thank you for your help!

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How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

Will windows 10 still accept the license keys from 7 and 8 now if I reinstall my computer?

Does Microsoft keep a list of users who upgraded to Win 10 using their 7 and 8 keys so that when users need to reinstall windows 10 the old keys would work?

Do I need to call in Microsoft to ask them to activate my Windows 10 when I give them my win 7 keys?

Both computers are laptops. The windows 7 machine had the serial printed on the back, and I needed to enter that when I upgraded to 10. The windows 8 machine had the serial built in inside its boot system so I didn't need to enter the key when I upgraded to 10, but I did manage to write down the keys using a fetcher program.

 

How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

Yes, still work, no need to call, just be sure to have internet access when you start to install 10, I work at pc shop and did this few days ago, used a key of 7 to put clean 10(wasn't used for upgrade).

 

Windows 7 Lover's Club: For Those Who Like Windows 7 As Opposed To Windows 8

Description:

• For anyone who likes Windows 7 as opposed to Windows 8 and wants to keep Windows 7 and not upgrade to Windows 8.
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Requirements:

• Be human. Male or female will suffice.
• Love or Like Windows 7 much more than Windows 8.

To Join:

• Make a post.

Benefits:

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