Trying to migrate from Windows 7 Ultimate to Windows 7 Professional (x64). Have issues. Please help. Thank you.

I have a 128 GB SSD drive and I bought a 512 GB SSD recently.  I used the disk copy utility to copy all the information from the 128 GB drive to the 512 GB drive. However, Windows 7 Ultimate N x64 is asking me to enter my key for validation. Unfortunately,
I cannot find the key used to install Windows 7 Ultimate N. When I used another valid key for Windows 7 Ultimate N, it would not accept the key because it is looking for the original key.  Since I didn't want to do a clean install, I was
willing to 'upgrade' to Windows 7 Professional x64. I went into the registry and changed the Product Name to Windows 7 PROFESSIONAL and I changed the EditionID to Professinal. When I was trying to install Windows 7 Professional, I received the following message:
The following issues are preventing Windows from upgrading. Cancel the upgrade, complete each task, and then restart the upgrade to continue. 
Your current version of Windows is more recent than the version you are trying to upgrade to. Windows cannot complete the upgrade.
There is not enough free space on partition (K:). A total of 15 megabytes (MB) of free disk space is required. Try Disk Cleanup, or moving files to an external location such as a CD, DVD, or external hard drive, and then restart the installation.
When I tried to rename one of my drive to K using disk management, it says the drive letter K is already mapped to a network share or a local path.  In order to see the volume after the operation, you must remove current mapping.
What am I doing wrong?  Please help. Thank you so much.

You can't just change the product name and have it work.  At this point your best bet is to
go to this thread and follow the directions and post your results in a new thread in
the Windows Genuine Forums.  That way, they can determine exactly which type of install you have and what your options are.
Please do not read this sentence. Please ignore the previous sentence.

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