Sadly it is likely that it will be very difficult for you to replace the cpu on your laptop (not saying it's impossible just telling you before hand that it is not the easiest/best price thing to do). i just googled your laptop name and i'm afraid samsung gave me this result:
http://www.samsung.com/nz/consumer/pc-peripherals/notebook-pc/essential/NP270E5E-X01AU-spec
samsung says it has an i5 which based on what you've said, it doesn't. If you reply to this answer and tell me the exact processor type (e.g. intel atom z520) i will check out cpus that will possibly fit the same socket (the part of the computer that the processor is put into).
I personally don't recommend doing this though, and manufacturers don't like giving you this option either
🙁 . If you are looking for a performance boost try some of the following:
- try installing LXDE ubuntu 12.04 as your second OS (this works incredibly well on less powerful laptops/desktops
- try increasing the ram if possible (this is alot easier than replacing the processor + it is likely that you can use new RAM with the ram in your laptop).
-check out this article from lifehacker
http://lifehacker.com/192585/the-15-minute-windows-xp-tune+up
(im guessing xp as ur os)