Como Poner Un Fondo Transparente A Una Imagen

I used Control Panel to set default software for opening PDFs, but if I try to open a PDF on my hard drive, the SureClick Chromium browser takes over. Then I have to close the browser and start over using 'Open With'.

(1) Can I disable just this open-all-pdfs feature in the SureClick browser?
(2) If not, how do I uninstall or disable the SureClick browser entirely?
(3) If neither, what system-level macro software would you recommend? The open-with nuisance is only one of many aspects of Windows that could benefit from automation.