Ad-aware and Spybot will catch adware and spyware, but generally not viruses But they're still good for the average user, since adware/spyware won't be caught by a virus scanner in general. Those 40 "new objects" are 40 pieces of adware found on your computer, and it would be a good idea to let the program clean or delete them

As for a virus scanner to run in addition to those two, there's AVG as far as free and somewhat decent ones go