Do you use Windows 7? Which browser are you using, IE,firefox or some other?

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i know that there has being a lone time competition between various browsers. As i like the windows operating system especially the newest one-Windows7, i have used the IE for a long time, which is installed while the system being installed. And the newest version IE8 seems improved a lot, it runs fast and smoothly. But recently, i found that on some wedsites such as the Sciencedirect-one of the most famous paper databases- i coudn't save the pdf documents to my disk. It's very strange and i have no ideas why. Then i turn to some other browers such as firefox. It resolved my problem perfectly, and i found it very convenient after some simple customizations. And it looks great if changed the theme. So, i'm considering change the browser, are you guys have some ideas? I'll really appreciate your suggests.