Neeed help bricked g2x

[CALIRENZ86]

Hey i had rooted a custom rom my g2x...but win i was driving i was messing round with the recovery an was tryna go back to stock so i could redo rom....but datz win it got bricked did something wrong.....my screen is stuck on black an white lg logo...ive tried the nvflash but im using windows 7(thing said has to be xp)....win i try to flash stock my phone is not found so it stops........can anyone help me or tell me how to get my phone from unbricked using window 7 or does it have to be xp...kinda new to this so if helpful make it kindergarden talk lol