Hi there,
I'm running Fedora 7 and everything has been running fine and the system updating itself happily when it now reports an error that yum can no longer access the repositories. I've attached the terminal output below:

[peter@takemusu ~]$ su -
Password:
[root@takemusu ~]# yum check-update
Loading "installonlyn" plugin
http://linuxdownload.adobe.com/linux...ta/repomd.xml: [Errno 14] HTTP Error 404: Date: Sun, 22 Jul 2007 01:26:56 GMT
Server: Apache
Transfer-Encoding: chunked
Content-Type: text/html; charset=iso-8859-1

Trying other mirror.
Error: Cannot open/read repomd.xml file for repository: adobe-linux
[root@takemusu ~]#

Any help would be greatly appreciated.

I would guess that the adobe-linux repo is down (or moved or whatever). I would disable it. Edit /etc/yum.repos.d/name of repo

Change the line enable=1 to enable=0. You will have to be root to do this.