I had the same problem!!
After searching internet and getting nowhere a bit of logic and a hint about hardware failure from event viewer, combined with cobsiderations of the symptoms during the crashes i can advise the following fixes
IF Closing runtimebroker.exe does not work (like it dod not for me)
Try loading a youtube video, leave it running then open minecraft
If it loads fine you can tab out of minecraft and close your browser
In this instance there is something wrong with your gpu driver
This worked for me for some time then stopped working i was back to square one, but i found the fix at least in my case anyways
Realtek HD Audio Driver being pulled from microsoft update is the offender.
- Go to Run
- Type 'devmgmt.msc' then hit enter
- Under Sound/Audio devices find 'Realtek HD Audio'
- Right click the device
- Remove device
- Tick box "uninstall device drivers"
- Reboot
After rebooting if you check device manager it should have reinstalled the Realtek device as a Generic HD Audio device instead. Minecraft will now load without issue
** please note, windows update tries to reinstall the offending Realtek HD audio driver, you can disable driver updates via windows update by using Group Policy (gpo.msc) just do a google for 'how to disable windows device driver update via gpo' theres pleanty of guides on internet adcising how to stop the auto driver update to nip it in the bud perminantly
Good Luck
-James