On topic: Start from your root directory (usually drive C) then go to windows -> System32 -> drivers -> etc open the "hosts" file using notepad read the paragraph to help you understand the file then enter this on one line by its self: 184.73.223.40 session.minecraft.net if that dosnt work then type session.minecraft.net
Give us the full error log, and also run this error debugging tool. Post both results here.
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On topic: Start from your root directory (usually drive C)
then go to windows -> System32 -> drivers -> etc
open the "hosts" file using notepad read the paragraph to help you understand the file then enter this on one line by its self:
184.73.223.40 session.minecraft.net
if that dosnt work then type session.minecraft.net