So your other card works fine in the PC card reader and the PSP?
If so and this new card does not work in either (nor on other PCs with different card readers), but it does show up (which it must if you cans see the files you want to copy) in windows with the card reader, then it sounds like the data on the card are corrupt.
You could try running the windows error checking on it and see if that helps.
If not then you will need to format it via the card reader.
Then see if it shows up in windows via the PSP in USB mode.
Dont save your games to it as its likely you will not be able to copy them to your PC and will need to format the card.
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