Getting corruption in decompressing zip/rar files is often symptomatic of some system problem. Could be the cache, ram, motherboard, IDE Driver, hard drive or any combination thereof.

Decompressing a huge zip file and MD5 checking them for consistency is a major sustained effort on CPU and ram. Its a benchmark in itself if you will. If a PC system has an error once in a million, then its normal that some heavy decompression tend to spot those problems.

We suggest running MEMTEST86 all night on that machine for the most obvious signs of ram/cache problems. http://www.memtest86.com/

But it might also be the IDE driver which misses a few bytes of info in copying or a corrupted download in the case of a downlodable Aria product for Mac. Normally, a corrupted archive won't uncompress and won't get to the md5 check.

But in some cases Macintosh's own uncompressing utility doesn't report errors in regard to file integrity and a subsequent install attempt will fail. The solution is to download the product again but this time uncompress it with The Unarchiver. This application will warn you about corrupted downloads. If after re-download you still have a corrupted zip file, your internet connection may be the cause. Try dowloading at a different time of day or buy the DVD version of the ARIA product.