Have you tried uninstalling and removing preferences before reinstalling? Given that you say it's been several weeks, I'm guessing you've restarted your computer at least once, but don't underestimate this step. Unfortunately, a lot of the time when AE, PR, or AME won't open or have errors like this, a process is stuck running in the background. You can either force quit the process, or even easier, restart your machine. It's also worth trying the Public Beta of AME just to see if it opens without error. This installs alongside the shipping version, includes its own preferences, and won't mess up your existing install (although it's having issues anyway). In order to use Dynamic Link, though, you would have to send your project from the corresponding public beta of AE and PR. But as a test, it's worth trying.