Try disconeting the printer from your PC, Then uninstall the drivers from your PC.
Also if did not alread try this, Unistall all the software for your printer from you PC.
Today I started to have a problem out of my printer. I have a Canon s300. I am using XP. I cannot contact tech support because it will cost me. I cannot uninstall the print driver. I have tried to uninstall this threw safe mode as well. I need to uninstall it and reinstall it to get my printer working. Everytime I uninstall it and reboot it is still there. Any suggestions?