Moved to a new thread.
OP the value on the download pages clearly states that the iso is 1570 MB. If your md5sum is the same as that shown on the page it is safe to assume that it is ok. If it is vastly different then there may be a problem with it. We have a faq on how to verify that the download and md5sum are correct. Have a look at it. Follow the advice by Balding_Parrot. I have personally never heard of the chaosmd5 program and can not verify that it is worth anything. But the programs mentioned by B_P are good and easy to use.
Frequently Asked Questions