OK... Whatever DID happen to Copernic??
I was using it when V.2 was released, but after having it installed for awhile it would stop working and I never could figure out why. By "stop working" I mean that it would still index regularly and built up an immense index file, but at some point it would stop finding most files. After it not finding a few things it should have I would enter some really easy searches and it failed every time. Copernic doesn't really support the free version very enthusiastically, and would eventually say, "Try re-indexing", or "Try reinstalling". Re-indexing never fixed anything. Reinstalling would get it working again but after a time (several weeks or a couple of months - can't remember now exactly) it would get the same symptoms.
Is it possible that it has a maximum size and stops working if your index exceeds it? (Google Desktop Search does exactly that. Has a maximum size and when you hit it starts acting up terribly).