SD Card (Reader?) does not work, malfunctions oddly

Calonyction

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Mar 30, 2017
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I use an Asus E403S laptop running Win10.

My old Lexar 64gb SD card suddenly considered itself write-protected and was impossible to unlock, even with the diskpart command. I got an identical replacement, but it is not working.
Before I got the new card, I messed around with different solutions for fixing the old card, and I am afraid I may have done some damaged somehow.
I have checked that other computers can read this new SD card fine. It is empty of contents.
But when I put it into my computer, weird things happen. It takes a while for the computer to recognize the card. When it does, and I double-click it, I am asked to insert a disc into the drive. Right-clicking the disk loads for a very long time, and the computer is unable to gauge how much space the disk has. In fact, the entire computer slows down as long as the SD card is in the slot - it even starts ignoring shutdown commands. Diskpart is extremely slow at interacting with the SD card ("list disk" takes minutes). I believe I once managed to get windows to show details about the disk, saying it was unrecognized or corrupted, but I forget how I got this information.

Diskpart says:
Disk ID: 000000000
Status: Online
Path, Target, Lun Id: 0
Location path: Unavailable
Current-Read-only State: Yes
Read-only: No

I have tried uninstalling and updating various drivers related to the SD reader. My external hard-disk works fine. I have run antivirus.

I assume I must have messed something up as I was using RegEdit or diskpart while trying to fix the other card. Does anyone have help, or an idea on whether formatting the computer would help?