That's really odd.
What version of AE did you have before you updated?
Reboot your computer, wait for everything to load back up, then launch AE. Once it opens, create a brand new comp in a brand new project using, say, one of the HDTV presets. Does it still crash?
Does AE CC 2014 still work? Please check: How to Find and Install Previous Version of Adobe Apps in CC 2015
If we can't figure out the issue, you may need to file a bug report: Feature Request/Bug Report Form