You will need to do a cold install most likely. You can try running it again like normal but it may not recognize the device.
So what you'll want to do is, pull the battery out, then plug it in to the PC. With the battery still out, run the desktop managers application loader. It should recognize it as an unknown PIN. Follow through the menu like normal. When it starts it will clear EVERYthing and then begin installing again. You will need to watch the progress and insert the battery while it is working. I recommend re-insterting the battery right when it finishes deleting all the files from the memory.
Let me know if that works. I hope so.
..the final frontier...