Verification failed / checksum failed

Hi,
This problem started just yesterday. I wanted to download (and later install) Firefox 4. When I downloaded the dmg, it says (in the "download manager window"): verfication failed. Or when I tried it with Chrome, it said: checksum failed.
So I thought I'd download a new Safari. But I get the same problem...
Anyone any ideas?

Try [repairing the hard drive with Disk Utility|http://support.apple.com/kb/TS1417].

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