Unable to uninstall spyware doctor

I currently have a free version of spyware doctor on my computer.  I just installed Norton 360 and now my computer is very slow.  When trying to uninstall spyware doctor I get this message " the unistall log file C:\program filles|spyware doctor\unins000.dat is in a format not recognized by the uninstaller"  Trying to contact spyware doctor is immpossible since I have a free version with no product code.  Thanks for any help