Put the summary of the bug you're having here
What I expected to happen was...:
the game to just start up
What actually happened was...:
as soon as i open a singleplayer world my game crashed
it doesnt connect to any servers but i have a stable internet connection
Steps to Reproduce:
1. launch the game
2. start a singleplayer world
3. crash
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Thank you for your report.
However, your ticket has been resolved as incomplete.
We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
.
Reminder: For technical support please use the Mojang Support Center.

i didn't try all version only all of the 1.8.X worlds

i tested all 1.8.X versions

AntiVirus / Firewall software issue, see MC-34749