did you try uninstalling and reinstalling java and minecraft?
Remove Reminder.png once the information is added!
Please add more information so we can help you identify the problem.
Mojang can't fix the issue without the proper information.
For example force a crash by holding F3+C for 10 seconds.
Then navigate to appdata\roaming\.minecraft\crash-reports\crash-(the date of the crash)-client.txt
Or provide a world download.
Thank you for the report!
I have a copy of the original Alpha 1.2.0
Mojang actually doesn't even have this version... im very embarrassed.