something isn't right

i am not an extremely computer savy person when it comes to the tech part of things.  i installed Norton internet security and uilitites,  I have run every scan and clean up that i can find on the program.  I went through and uninstalled anything on my computer that wasn't being used or that i didn't recognize and i am still getting pop ups constantly.  I am also getting a tool bar from "shop at home" that i continue to hit remove on that won't remove.  Words in my screens are hyperlinked so when i am reading i get those pop ups and i have to hit norton settings, browser protection to turn it on everytime i am on the computer.  Any help would be appreciated.  I have to use Firefox because of my daughtersonline school and Java is required. 

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