are you using the latest version of Adobe Illustrator?
Hi. Please try resetting the preferences: https://helpx.adobe.com/illustrator/user-guide.html/no/illustrator/using/setting-preferences.ug.html
Also, check if your computer meets the minimum requirements: https://helpx.adobe.com/illustrator/system-requirements.html
Sorry to hear about the trouble you are facing. In addition to @marliton suggestion, you may also try the following steps and let us know how it goes:
I will be looking forward to your response.