processor question

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http://forums.opensuse.org – I'm looking at new laptops. I'm considering a Dell that has an Intel Core Duo 1600 MHz processor. My questions: Is this a 32 bit or 64 bit processor? Will this processor handle VirtualBox? (I'm told my p4 isn't capable of running two os) What is the difference between the Core Duo and the Core 2 Duo? Thanks for any answers you can offer. (Distributions)