I have downloaded fc4 images a couple times, and each time when I do the check of the image, the message is it is corrupt; does anyone know what I am doing wrong?
You don't say how you checked the image. Firstly be aware that mediacheck is potentially unreliable.
Select a suitable mirror:
http://fedora.redhat.com/download/mirrors.html
Download or copy the SHA1SUM file from your mirror.
Do the check using:
sha1sum -c SHA1SUM
You will get error messages about the iso images you did not download such as the DVD iso and possibly the SRPMs that does not matter.
If all of your isos are OK you have nothing further to do except burn them and install.
If any iso(s) fail go back to you mirror list and select a suitable rsync mirror and correct the corrupt iso using rsync as follows:
rsync --ignore-times <the rsync mirror taken from the list>
Example, using an rsync mirror from the Asia/Pacific Australia section of the list:
rsync ignore-times rsync://rsync.planetmirror.com/fedora-linux-core/FC4-i386-disc1.iso
The above command is all on 1 line of course, ignore what your mail client does to it.
HTH Bob