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While checking what packages were available using the yum tool I kept getting the message:

Repository base is listed more than once in the configuration
Repository addons is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository updates is listed more than once in the configuration

I couldn't find a great deal of help on the internet (hence this post!) but eventually it turned out that I had a .repo file which was listing the same repositories as my yum.conf file. The .repo file was in /etc/yum_repo.d/ directory, but yours might be called something else. So, check for a /etc/yum* directory and see if you find any .repo files. In my case they were identical so I used renamed the .repo file to .repo.hide and used yum.conf instead.

I hope this helps someone as I know I could have done with finding it 2 hours ago!

PS. Merry late Christmas.

Wow, long time since I posted on here! If you see your previous Windows wallpaper/desktop image every time you shutdown or boot up then you might be interested to know how to get rid of it for good. The solution is simple (he says with hindsight): Just select 'None' from the list of wallpapers (having right-clicked on desktop and gone to properties > desktop) and then click 'Apply'. Then select your current wallpaper again and click apply. Next time you shutdown or boot-up you will just see a plain wallpaper rather than that old wallpaper- hooray! (Source: Found this first which lead me to this KB article)