Cubase 5 crashing on plugins that are not installed anymore

I’m running good old Cubase 5 on my new Windows 10 DAW. This works fine but the effect list is still showing plugins that are not installed anymore. (like IKMultimedia demo plugins). These plugins are not installed on my DAW anymore but Cubase 5 is still showing them. When I sellect one of those plugins, Cubase 5 says they’re not installed anymore and I have to install them again. This message is fine but the problem is Cubase 5 is crashing.

Re-installing Cubase 5 doesn’t help.
How can I remove the list of “not installed plugins” from Cubase 5?