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netseeker is right. This really sounds like a corrupted internal memory issue.
On a Windows system, a 505 will show up as 3 USB mass storage devices, corresponding to the internal memory, MemoryStick slot, and SD card slot. Either or both of the latter may, of course, may only have a device letter and no media, depending on what external memory you're using.
In your place, I'd do a hard reset (you have nothing to lose, after all) and then test out the 505 again.
Also, you were actually on the right track with trying a different USB cable; while that's highly unlikely to be the cause (although I did once spend a couple of hours trying to diagnose a printer problem that turned out to be a bad parallel cable) that's an important step in a technician's diagnostic process: make sure you have known-good parts for everything but what you're testing. So try a different computer, too, and see if you get the same error (you don't need the Sony software, just plug it in and see if the OS throws a fit about filesystem problems).
Also, once you get this resolved (and for everyone else reading this thread), always stop a USB device properly before you remove it. Otherwise ... well, this happens. I don't remember what provision the Sony software has for this, I haven't used it in so long, but cailbre has a nice big "eject" button up in the menu, and of course there's always the icon in the system tray. If you don't stop the device, Windows could have data buffered but not written -- or be in the middle of a write -- when you unplug your device (this goes for any mass storage device, by the way), and the filesystem on that device can be totally hosed. Which seems to be what you're looking at.
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