No package cache available in RPM. Please help

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http://forums.fedoraforum.org – I was trying to install mySQL and i ran a few commands that maybe i shouldn;t have. Code: [pgar23@python ~]$ su Password: [root@python pgar23]# history #Trying to get rid of everything mysql  541  rm -rf *mysql   542  rm -rf *.mysql   543  rm -rf *mySQL   544  rm -rf *.mySQL   545  rm -rf */mySQL   546  rm -rf */mysql 557  rm *mysql   558  ls   559  yum remove --purge mysql   560  yum remove mysql   561  yum clean   562  yum clean   563  yum clean packages   564  yum clean headers   565  yum clean metadata   566  yum clean dbcache   567  yum clean plugins   568  yum clean all And now, when I try to System> Add/Remove software i receive a message stating ; No Package cache available. The package list needs to be rebuilt. This should have been done by the backend automatically. V More Details failed to get groups from comps: Cannot retrieve repository metadata (repomd.xml) for repository: rpmfusion-free. Please verify its path and try again I am trying to back-up my machine and this process is so difficult. I wish someone had wrote an idiots guide to backing-up a linux machine. :) (HowTos)