How can I fix syncing of my new computer with my Dropbox account?

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I have a new computer on Dropbox. It shows up as being an active account on the Dropbox website. The application is downloaded on the computer. The new computer shows all of the folders but no files whatsoever. Documents put into these folders on the new computer don’t sync up to Dropbox and no folders (or updates, of course) come down from Dropbox to the new computer. Two other computers are on this same account and they both sync perfectly. All computers are PCs, no Macs involved. Any ideas as to how to fix this?

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