WPNG now showing after I moved and imported databse

I’m using WP3.2 and WPNG for google calendar. However, I’ve moved my site to a new server and imported the old SQL database BUT all the plugins hadn;t been deactivated because there had been a malware issue.

Problem now is WPNG plugin is “showing” as installed but not displaying in the Plugin list.

How do I delete the reference to it in the SQL database, or entirely remove reference to it and start to install it again? Thanks in advance