Plugins are installed into your user folder (~./config/calibre/plugins on Linux ) so they stay even after a reinstall. You'd have to delete that folder or delete plugins through Calibre to get rid of everything.
If the plugin keeps the ACSM file there was an error while turning it into an EPUB or PDF file.
I'd need to see the logfile to find out why.
In Calibre, right-click the "Preferences" button then select "Restart in debug mode". When Calibre restarted, try to import the ACSM file again then close Calibre. After that a log file should pop up which you can post here.
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