I suspect you basically are in a clean install state at the moment, with a zapped Bayes db. YOu can do a dump magic to see the number of spam and ham tokens in the db. Probably you just have to re-learn the mandatory couple hundred spam and ham messages to get Bayes running again. Alternately you could completely remove the 3-4 Bayes files and let it start over, but I suspect that would be a waste of time.
I'm surprised though that Bayes counts so heavily for you. Granted it is helpful. But even without net tests enabled, the standard rules should be catching will on the order of 50-80% of the incoming spam, if not more. Probably quite a lot more, especially if you have any of the standard add-on rulesets. If you are running net tests and SURBL you should be catching probably 95+% of the spam just with the net tests. Loren