Im not sure if your having the same issue I did when I unlocked mine, but if your computer doesnt have the right drivers for your phone then it wont unlock when you go through the process.
an easy way to take care of this is to put it in the bootloader mode and leave it plugged into the computer via usb connetion.
if the bottom of the screen stays blank then your computer doesnt have the right drivers for your phone.
It should pop up saying 'usb' at the bottom of the screen on your phone after like 10 sec or so.
if it doesnt then it wont work.
Ive figured that out over the last few months when I first unlocked my phone. It was frustrating at first, but its an easy enough fix.
http://www.freewareppc.com/utilities...shutdown.shtml
heres a link to an app that has an option to put the phone in bootloader
just do that and let your computer install updates for the drivers if it needs it and then you should have no issues.
goodluck