Apparently Instashare keeps finding a way into my computer. I have used Norton Internet Security to remove it (and it does) however it keeps finding a way into my computer. Also, something keeps downloading harmful browsers to my computer as well. I think it has to do with a vulnerability in XP. I'm afraid that my data is at risk. Please help. Any suggestion will do. I'm using XP Professional and Internet Explorer 8.0 is my default browser.