System with Windows 7 installed, Windows 10 disc came with it, and compatible programs and O/S files.

The pc owner bought a Dell from Amazon. It came with no Windows 7 disc but had 7 installed on the system. They got a Windows 10 disc.
I do not have a photo of the disc and could not likely get a photo for a week.
I think this was built as a Windows 10 system and there was public demand for a Windows 7 system with the same specs like i5, etc.

If and when he decides to switch to Windows 10 and he uses the disc that came with the system do the Windows 10 files replace all those from Windows 7 or do the two O/S's share certain files?

He is concerned to lose programs like Any Video Converter, etc. as well as all his documents and videos.
I know he won't lose any documents.
What about programs? I can guess that some of the free programs he wants to use may be not compatible with Windows 10.
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There are two scenarios. He has a Windows 10 disc to finish or enable 10 over the Windows 7 installed installed system. (and I think the pc was built with Windows 10 installed ??)
And all his desired programs are on the pc already. What about loss of programs?

The other scenario is like my situation where I have a Windows 7 system built before Windows 10 was born, I think.

I'll have a Windows 10 disc with product key whereas he does not. His disc does not have a key.

Any answers, comments, etc.?
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nickg5Asked:
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JohnBusiness Consultant (Owner)Commented:
When you get such a system (we have done this) you can use the Windows 10 media to install Windows 10. This is best done at the beginning. If you wait, and set up Windows 7 , you need to back up before later converting to Windows 10 in case something does not convert
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nickg5Author Commented:
As far as setting up Windows 7 he just started using it, downloaded and installed some programs, added printer, camera, etc.

He waited because his disc did not expire like the free upgrades July, 2016.

How are the Windows 7 and Windows 10 files integrated?
What will he lose from Windows 7 when he switches to 10? Some O/S files will be removed or ..........
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JohnBusiness Consultant (Owner)Commented:
Often you can upgrade and keep everything. but there is never any guarantee if the software is legacy. The situation is the same as taking a Windows 7 system and doing a free Windows 10 upgrade. Some worked and some did not work. If the owner wishes to go to Windows 10, the sooner the better to avoid later incompatibilities.
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RaminTechnical AdvisorCommented:
If you upgraded your current PC from Windows 7 to Windows 10, your Windows 7 license expired 31 days after the upgrade. An update version of Windows 7 won’t work either. You need a retail or OEM version that hasn’t been used.
so my suggestion is stick to Windows 7 for some more time.
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JohnBusiness Consultant (Owner)Commented:
I don't think so. When you purchase a new system (as described above) with downgrade rights, you can upgrade to Windows 10 after 30 days has elapsed.

Once upgraded, yes, you only have 30 days to go backwards.

But the longer one waits to go forward, the greater likelihood of legacy software.
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nickg5Author Commented:
I won't buy a Windows 10 system until late 2019. (  Windows 7*       Service Pack 1       January 13, 2015       January 14, 2020 )
I got a 7 in late 2016 and in only 2.5 years will no longer be supported. I was late leaving Vista though.
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The pc owner who has a 7 disc will likely switch to 10 in coming weeks or months or wait until late 2019 too. Up to them.
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nickg5Author Commented:
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JohnBusiness Consultant (Owner)Commented:
Thanks and good luck for the owners above.
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RaminTechnical AdvisorCommented:
Thanks,
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