It appears that your firewall may be blocking Box.net or you are encountering an error.

Please contact your IT administrator to configure your firewall to recognize all sub-domains of .box.net and .boxcdn.net. The ports that should be opened for these domains are 80 and 443.

If that does not resolve the issue, then please submit a support ticket at http://www.box.net/help.
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Help › Zip File Corruption
When a batch of files are set to download to your desktop as a zip file, the zip will appear on your desktop before the download is completed.  If you attempt to open the file before the download is complete, an error message will appear.  Please allow the zip file to finish its download before attempting to open it.
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