vroooom ptssssh: spyware doctor is a program just like the "adaware" program mentioned here. The program has the same intentions, and that is to remove any unwanted spyware on your pc. But I would advise you to download adaware aswell, as the spyware doctor program might not get all the spyware.
Even though the programs are set out to do the same, they will search using different methods, so some program will find more spyware than others.
So yeah its ok to have downloaded spyware doctor, because it removes spyware
Hope this helps