Minecraft Will open launcher but won't launch

I have been trying to launch minecraft for forever now but it won't work, I've tried uninstalling and reinstalling java, but it won't work, i have tried uninstalling and reinstalling minecraft, i have restarted my computer, i have put on admin mode, i have done everything i can think of.
This is the error message in the output log: expected 3b666765bafa02e84e24b371d9efd7a4d1b6e188 but was c2ba0c4da30cce204c70db2ebc32a942cea8c7dd