ok here it goes. I got a computer in my house and my girlfriend got her pc to.i can only connect on pc on my internet connection at a time. So i bought minecraft alpha and play it on my pc. I had to do some repair on my so i send it to the shop. So before sending my pc i have copied my file on my girlfrind pc and plug it in internet to get an update. Everything have work good until my pc comeback from repair. my girlfrind seeing this awsome game want to play to. So i brought her a copy of minecraft alpha. The problem came when i try to set up a lan game (witch i already done with my bro and his computer with no problem at all) i can join my server and my girlfirend to on her pc but we cant play together. When she log in , it kick me out saying i have spawn somewhere else. So i not a pro on pc but i knew it was an id problem. server thinking she is playing with my copy of the game but its NOT TRUE ,i paid ofr her copy of the game. I have erase all folder and file in.mincraft folder and redownload the game on her pc for a fresh start. I doesnt work. i need help to erase my player id of her pc plz.