Is your Illustrator crashing while opening a new document or saving a document? Most probably it's due to a known issue with Windows 10, which is now fixed.

Quick resolution

Download and install the latest update for Windows 10 (v1803, v1809, and v1903) or update the latest version from Start > Settings > Update & Security > Windows Update.

More about the issue

In Windows 10, a known issue exists with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs. Due to this issue, Illustrator crashes when you open a new document or save a document. This issue is fixed in the latest Windows 10 update released by Microsoft on October 08, 2019.

For more information: