It depends on where you live. I've seen people with average download speeds of 4mb/sec and people with average download speeds of 10kb/sec in the US. (Mostly cuz in the US, remote areas are not cared for by ISP's)
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Back on track...
Infact, Onyelz is correct. The error you've received is one you get when your archive is corrupt. This means that the archive wasn't fully downloaded. Look through your files by filesize, and a corrupt archive will take in less memory than a working one. (Note that the final archive always takes in less memory)
This may hint at your connection breaking after a long download or something of the sorts...
You can try redownloading the corrupt archives.
Alternatively you can try this old version (0.7.0.1):
http://www.mediafire.com/?l8zvedbv6u248 (this would require longer updating however)
There's really nothing much else you can do about it.
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