After update, it keeps crashing. And when it finally launches, the files are not opened by DW
Have you restarted your system since installing the update?
If you have, and you're still having issues, run the CC Cleaner tool and reinstall...
Make sure to restart after each step (uninstall > restart > install > restart) and see if that doesn't get it up and running for you.
If not from Dreamweaver, how are you accessing files -- from Bridge or your OS's file manager?
Which operating system do you have?
Is your local site folder defined? And does it reside on your primary hard drive?