My computer keeps coming up with a message that i need to restart it

my computer keeps coming up with a message that i have to restart it
it never used to happen now it happens nearly every day

You can go back to original hardware; run Apple Hardware Test even.
Remove 3rd party RAM ( much rarer I think )
USB printers, cables, devices and drivers.
What changed?
Also, this is not MBP forum.
http://www.apple.com/support/macbookpro
And if you are running Lion, head over there, or Snow Leopard OS X community.
FAQ kernelpanic
Avoiding eliminating Kernel panics
Mac OS X Kernel Panic FAQ

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