Can't open Premiere Elements 2019

The hardest thing to help with on this forum is when Premiere Elements stops working after a period of working well.  The program code does not change.   It forces a look at the computer itself that includes changes, updates and even pending failures.   The easist thing to do with the greatest results it a full uninstall followed by a fresh installation.   That will not effect existing projects.

>used it last week and today it wont open

What about your computer has changed? Has Windows or Mac done an update?

Nobody can help without the DETAILS that you have not provided

First, this is not Adobe support, it is a space that is provided by Adobe for users to help each other

You need to provide details for anyone to help
Mac or Windows and exact version of the operating system
Exact Premiere Elements version
CPU brand and model and clock speed
Video adapter brand and model and driver version and amount of video ram
Number and size and type of hard drives