Fan wont turn off...  mb slooow!

I bought my macbook about 6 months ago and it was super fast... up until about 2 months ago.. not sure what happened. Also around that time the fan started coming on for no reason at full speed. I called support and they had me empty my caches... i immediately noticed a difference.. at least with the fan. the mb is still noticeably slower that when i bought it.
my moms bf updated my memory from 2 - 4gb but i havent really noticed much of a difference.. still slow. and now my fan started coming on for no reason again i emptied my caches again and nothing.
I don't really do any downloading, i just use my computer for email, school, internet etc.. like everyother college kidd.
any ideas?? im annoyed!!!

Going from 2 GB to 4 GB of RAM is not likely going to make any difference in speed unless you were running very RAM intensive applications which you are not according to what you said.
But to say the fan is running for no reason is probably not correct. The CPU is probably hot. The question is why.
Run Activity Monitor and select "All Processes" in the upper center of its window. Now select the %CPU tab just below that. This should show the amount of CPU usage of all the processes that the computer is using. Most of them should read 0. a very few should read a small number. If anything is reading over 10% continuously this can explain your fan being on. Report back here if and what items are using a lot of CPU and maybe we can get this straigthened out.

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