Choppy Playback in PP 2022

I havn't been editing for a while. When I started back up first I updated to latest version of PP "2022"
Opened a reecent project and the time line playback is choppy. I also imported serveral video files from different sources, new and old. Mp4, MOV, AVI ect. they all were choppy. I uninstalled PP and reinstalled, made sure cache was clean. Same problem. Any input would be welcome..... Also the video files work fine in Windows Media Viewer and when imported into Pinnacle Studio 24.....
Thanks in advance...
DK
