Your home PC can’t read the card at all now? Or does it show up in My Computer as a greyed out icon that you just can’t click? If it’s greyed out, you should still be able to format it. Or, if you have access to it, the Mac should be able to format it as well with the option to do ‘PC-readable’, or maybe it’ll give you the exFAT/FAT32 option (assuming you already backed up the contents earlier?).
If it’s not seeing the card at all, earlier you mentioned it’s a micro-SD card if I remember right? Try pulling it out of the regular SD adaptor, then put it back in? Try another adaptor? Does your PC still see other cards?
otherwise what Thunder said in 58 is correct.
Yes, it’s a microSD within a standard adapter. I have two adapters. Both yield the same results.