Sorry about the trouble. Could you please share a few more details like:
OS, OS Build, and version of Illustrator
Are you using 32-bit Windows or 64-bit windows?
When did this start happening? Are there any recent changes made to your system? For example, any antivirus, system updates, plugins, or web extensions installed recently.
Does resetting Illustrator Preferences ( https://helpx.adobe.com/illustrator/using/setting-preferences.html) help to resolve the issue? Disclaimer: Please note that resetting preferences will remove all the custom settings, and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. Location is mentioned in the article.
If resetting the preferences doesn't help, then I would suggest you try the following steps: