That plugin was last updated 2008-11-20 and it’s doubtful it will work with a new version of WordPress and correctly revert URLs or changes it makes. Try resetting permalinks in Dashboard>>Settings>>Permalinks.
And, because your question is very specific to that plugin, you’re much better off asking in the wordpress.org forums tagged for that plugin: http://wordpress.org/support/plugin/html-on-pages
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