Hard disk not opening

[jewelstone02]

I had this old computer that stopped working fine so I took out the hard drive, put it in a casing and tried to connect it to my system but it doesn't come up.
I get 2 partitions, system reserve and local disk G, the system reserve opens but shows it's empty even though it says some memory is used and I cannot even interact with the local disk G at all cause it hangs my computer till I unplug it.

Please help, I can't lose all my memories.

 

[seagate_surfer]

Hello jewelstone02, are you connecting this drive as an additional one or main drive? Was the OS of the old computer on this drive?