I have the exact same problem too, it always produces a network error code when I try to copy from my PC to my activated, registered, never fooled around withand Memory Stick Duo inputtedPSP.
This is the Error Code:
Network Connection Error 80048104
I googled it and it was said on some forums that it's due to virus protection software. I tried to deactivate it, I tried to run as admin, but nothing changed.
Whenever I try to transfer it this error message pops up and the transfer doesn't even start. After about 3 hours trying and googling everything I could I just gave up, annoyed and pissed like hell -.-
Anyone knows a way due to given circumstances I still can get my DLC from my PC to my PSP or what this error code in specific is?
TY in advance