I have been playing minecraft for about a week now. I am using a minecraft launcher that only requires a nickname and I can play the the entire game except multiplayer. So I tried playing LAN with my little brother. I am using windows 7 and hes on windows xp. Anyways, about every 7/8 times we play LAN, his computer will crash within a second. Mine will stay fine but his crashes with system error .It doesnt happen everytime but really close. We both have the same optifine installed, and the latest version of java. Can someone please help me fix his computer error?
If so, then no one here will help you.
If not, then why don't you just use the normal launcher?
Also, is your brother using the same launcher?