Launcherem čeho? V případě Minecraftu mrkni sem: http://www.minecraftforum.net/forums/support/unmod ified-minecraft-client/2366500-incremental-cms-dep recated
http://www.minecraftforum.net/forums/support/unmod ified-minecraft-client/2671469-java-hotspot-tm-64- bit-server-vm-warning-using
https://www.reddit.com/r/Minecraft/comments/3vkalu /minecraft_wont_get_past_the_launcher/edit your launcher profile.
Change the Executable from "javaw.exe" to "java.exe"
Have you tried updating your java? Maybe reinstall the launcher?