I bought a Inspiron 600m last month.

At first everything went great.

a month later, I did a disk defragmentation, and the OS starts slows down.

So I reinstall the windows XP Pro, but the problem remains.

For instance, After the windows started, I opened MS media player, first 5 minutes it is ok, then the picture is hardly moved, only song that play.

And every time I opened internet explore, it takes 5 -10 seconds to come up the window.

Is there anything I can do to fix the problem?