How to access the data from my old hardrive

my old laptop died on. Me after taking out the SATA hardrive and putting in to a SATA-enclosure, I am able to access one of the two important partitions that were on that hard drive. The biggest one which has most of the data however, I am not able to mount.

My old computer used Windows 7. My laptop now is using Windows 10 (in case that is important). I have tried to fix the problem with diskpart and other tools found online but without any success.

Please see below the print out of the diskpart command. As you may see there are two hard drives shown. The first one *( 0 ) being my current laptop and the second one *( 1 ) being the hard drive in the USB enclosure. Unfortunately, Windows wont allow me to use the assign command to mount the large windows partition. I have read online that this my be a rights issue, but I am the administrator on my machine and diskpart is run with administrative privelidges, so I dont quite understand what I could do differently.

Is there another tool I can use, or some other command I have to run prior to assign to mount this partition on my old hard drive?

Thank you

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