I'm afraid that now that you are infested you will just have to follow the removal steps. You should also be aware that this particular piece of malware can embed itself into random Windows shortcuts, thus "bringing it back from the dead" after you've removed it from your browser(s). So you might want to check any desktop shortcuts you have for extraneous command parameters before cleaning up the browser(s).
Always pay attention when downloading and installing free software from the web. Scan all downloads with a current antivirus program before installing.