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Make sure the contacts in the PSP's mem stick slot are clean... no dust/dirt in there. Format the memory stick on your PC then put it in the PSP. If the PC can read it and the PSP can't, you'll need to send in your PSP for repairs.
It's not so easy to erase PSP OS and if even you do it you wil brick your PSP(Your screen will be black when you will turn on it and only green light will flash few times.) I think you have bad memory stick or something like that. Because you are browsing memory stick and not PSP when you connect PSP to computer. Check if you have memory stick inside your PSP. Try to format memory stick in PSP. You can also try to restore PSP deafult settings. If you have Card Reader try to read and format card on computer. If nothing helps buy new memory stick.