A web savy friend helped us set the store and upload .zip files of mp3s to sell.

We're now noticing (after our first 2 customers) that the files aren't downloading correctly.  The file sizes are around 65 MB and the download at only about 5M, we have re-uploaded the files but it's still not working..

Would love to solve this fast as we need to get the customers their products..
Any ideas?
Thanks!