It isn’t quite clear to me from this description whether you reinstalled first, THEN chose Run as Administrator/Repair.
You might find it worth one more try, first uninstalling completely from Apps and features/Sketchup then click Uninstall.
Then try a new installation as described above.
I’ve seen a few reports on the forum where running Repair didn’t fix a problem, but a complete uninstall, restart computer, then reinstall using Run as Administrator did clear things up.
Like earlier respondents, I had no trouble importing the DWG file, creating a face from the edges by drawing a line in SU, then pushpull worked without issue.