No idea on the cost to hire someone.
You could just install the OS over top of the old one, but then you are going to need to re-install all your apps anyways.
You will need to look up you specific type of Dell computer to be able to tell if you can upgrade. You probably can; I would guess the odds at 75%. but a 64 bit OS requires a motherboard and a CPU that can run it.
And be aware, there are some peripherals that don't work on a 64 bit OS. Most things will have 64bit drivers, but be especially sure to check your printer maker to see if there are 64 bit drivers.
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"The problem with any ideology is that it gives the answer before you look at the evidence."
—Bill Clinton
"The greatest obstacle to discovery is not ignorance--it is the illusion of knowledge."
—Daniel J. Boorstin, historian, former Librarian of Congress
"But the Senator, while insisting he was not intoxicated, could not explain his nudity"
—WKRP in Cincinatti
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