SP2 will automatically make the necessary changes to your operating system so it recognises all 250mb of your hard disk. There will be a whole pile of additional updates to be installed once you've got SP2. I would go to the Microsoft Update site and get both Critical and Recommended updates.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.