If it's being that finicky, try using an Ubuntu Live USB stick (runs ubuntu linux off of your usb stick/you can run off a CD too). Open the Ubuntu Software Center (icon on the left autohide dock/ or hit the Windows button on your keyboard and start typing the name Ubun...), install ADB and heimdall (ADB is the drivers to talk to phone and heimdall is the program). There are a gazillion tutorials on how to use heimdall from the terminal (similar to DOS prompt). Good Luck! P.S. I forget the command, but there is a small command to start the ADB service for heimdall to work.