Are you able to get into Windows with the old SSD in the computer? If so, then you can do a backup on the old drive; then power down, swap drives, and boot the computer with the backup software's emergency boot disk; then do a restore to the new SSD. Once you are in Windows, make sure TRIM is active on the new SSD, and you're good to go.
If you can't get into Windows with the old SSD, perhaps you could put it in another computer as the secondary drive, then do a backup of it. Once you have a good backup of the old drive, you can restore the backup to the new drive.
Macrium Reflect Free is good backup software. You'll need an external hard drive to save the backup to; and don't forget to make the Macrium emergency boot disk (It isn't called an "emergency boot disk", but I can't remember what they call it; it allows you to boot into Macrium when the hard drive is blank.)
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