I would like to know if it is possible to upgrade the processor in my netbook


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I was hoping that someone could tell me if I could do it, wither it is worth it and what I processor I should get.
I was given a netbook by my brother it was a cast off but it was good for my work as I have a lot of travel it has always been slow and some of my programs don't run properly. It is a Toshiba NB 250 I have just upgraded the RAM from 1 GB to 2 GB as that is the most the mother board can take.
It has a intel® Atom ™ cpu n455 @ 1.66GHz
It runs windows 7 starter.
Any help is welcome.