Answer:
The way that you would erase Spyware Doctor is by using your uninstall feature, which you get by going to Start-->Control Panel--->Unistall/Add Programs
You should search for all SD older refferences before a new fresh instal
Go to Start -Search-All files/folders-More Advanced Opitons - check the options"Search System folders" and Search files and hidden folders"
In the search bar type Spyware Doctor
This will show all SD references you have instaled.Delete All and install SD From a fresh setup downloaded from the PC Tools website