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How to associate a PFX certificate from different identity (Windows-7) to upgraded computer (Windows-10) with new identity?

User upgraded to Windows-10 from Windows-7 created logon user identities are different from original. Encrypted data files were copied to new computer, but unable to access/open encrypted files. Installed .PFX and .CER objects from old PC to new one using certlm.msc. Still no joy! Assume the issue is different identities. Old identity is XXX-SSD while new identity is MySSD.  CER and PFX objects installed from flash drive.

Reviewing CertLM the certificates appear in following:
                CERTIFICATE           -                      Issued To             [Comments]
 Personal            -                                      MySSD                  [new identity]
Trusted Root Certification                              XXX-SSD                    [prior identity]
Intermediate Certification Authorities      XXX-SSD                    [prior identity]
Trusted People                                        MySSD                  [new identity]
Other People                                               MySSD                  [new identity]
Homegroup Machine Certificates  -            XXX-SURFACE
                                                            XXX-SSD-PC
How do I associate the prior PFX with identity XXX-SSD to new identity MySSD?
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dew_associates
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In short, you can't. A certificate, once installed, is unique to the SID of the computer and its OS. A new certificate must be installed.
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Buddy

ASKER

For my own clarification. I have imported .pfx object from one OS upgrade to another before and had no difficulty with encryption. With the enhanced security of Windows-10 versus upgrade from Windows-7 I moved the Win-10 OS from HDD drive to SSD drive - The end result is I can no longer boot into the Win-7  OS to un-encrypt the files in that environment. To make matters worse, I changed the logon identity as defined in initial question.  Microsoft did not provide an adequate solution for those who wanted to install the new Win-10 OS on an SSD drive during the upgrade. Is there a way of recovering the win-7 boot to enable me to return to that OS to un-encrypt the files?
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dew_associates
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Thanks for your comments - I now have a better understanding of the way I box myself in. Any suggestions on How to get a Dual Boot option which would enable me to boot into the Win-7 OS?
To be honest, I haven't yet tried to dual boot Windows 10 with any other OS. I am still trying to get past some of the worms that I have found. You might want to try setting up the dual boot on the Windows 7 drive and then point the secondary boot to Windows 10 on the SSD drive, but this is only speculation on my part.
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ASKER

Thanks
I appreciate your input

Buddy