I need help with my computer!!!! please help!?

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Help! i was on my on computer and I downloaded this minecraft map. When I did Amazon ( http://www.amazon.com ) opened up on google chrome.. but I didn't mind. Next day i got on my computer, i started it up and it happened again; so every time i startup my computer, Amazon just opens. I have tried deleting google chrome. but that didnt work it just opened on firefox and other things. Than i tried going to CMD and putting and doing the option for config (Open Start, Run, and enter the command msconfig (on Vista or Windows 7, this is Start, Search). This opens the utility. There is a row of tabs across the top. Select the Startup tab) but that didnt work either HELP PLEASE THIS IS REALLY STARTING TO GET ON MY NERVES