Sorry for the very basic question, I'm new to this forum & have spent a lot of time searching unsuccessfully for a solution.

My OS is Vista Home Premium, I have the latest, updated, free edition of Spybot on my home laptop. However, the Spybot browser settings auto-default to IE and Firefox. Can't find how to change my default browser to Chrome, which has been my browser for years?!
My laptop is running very slow. I have to manually delete cookies daily. Frustrated!

Thanks in advance, would love some advice please.