Windows Vista click.findsearchengineresults (virus) hijacked my ie browser

Hi.

After downloading a new sharing program called "DropBox" it immediately opened my documents folder and it also installed a browser hijacker named "click.findsearchengineresults" which brings you to a bogus search page. I have the virus on my laptop and worktop computer but I will start with my laptop first. I'm running Windows Vista Ultimate SP2 on a HP Pavillion laptop. Please help, Brioni where are you!!!!