[hamagc]

there is no way to wipe the device to start from scratch.

i would say lets skip the stock rom and try another but the issues seems to be that you can't unlock. without unlocking, you can't test out a custom rom.

seeing as you can't get the phone to boot at all to get into the phones memory files, you won't be able to unlock from the memory card (have to put the sspl file on the main memory on your phon).

just for shit and giggles, try updating/reinstalling the windows media device center.

is this an alltell branded device? you could try flashing a sprint rom to see if it takes.

if you can't access the files on the phone from the computer, i'm not sure what else to suggest without playing with it myself.