Illustrator lowers the quality of text and when importing images

Hello, I installed Illustrator v 24 and at the time of importing an image or writing a text is pixelated, I thought it was screen error that was miscalibrated, but at the time of exporting it looks even worse, I can work on a table 5500 px by 5500 px and pixelate everything I do, I’ve already removed it and reinstalled it and the problem continues.

Help!