I recently learned about MINECRAFT logs , and my smart ass was like WOW that must be a lot of memory used! So I went ahead and deleted each and EVERYSINGLE log I had, after that I tried to open up minecraft but I couldn't since Java was crashing I don't know what to do and can't find anything so if any of you know how to help please I will give bj I blame @Danielcole321 for telling me about this
Idk if you are premium or cracked i would reccomend resetting your launcher, it works for me when my teamextreme launcher doesnt open. And also for the future make sure that you set a Computer Restore Point(i am not sure if this is what its called) you can also look that up. Btw A Computer Restore Point is a sort of save where you can reset your computer to the state that you registred it as. You probably didnt understand it at all.
You can try what the people above me have said Or You can (Make sure MC is closed) go to %appdata% and delete the .Minecraft folder, then open up Minecraft and run it.
I did this at first but it was still crashing, I got it working today after I realized there was 1 more log in that folder, for some reason there had to be no logs for it to work