Missing package for loading fedora [closed]

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Hi everyone, I'm sure the title of my post can be misread. Here is the trouble: Since two weeks I was facing some problems for my fedora (I upgraded f19 to f20 since two months). I had some dependency issues. I have exposed my problem on two forums ask.fedora and forum.fedora. Yesterday, Heldwin from the second forum proposed me this three steps to solve the issue

rpm -e --nodeps libquadmath-devel libquadmath libgomp libgfortran gcc libstdc++ cpp
yum install libquadmath-devel libquadmath libgomp libgfortran gcc libstdc++ cpp
yum update

The fact is that I unintentionally omitted to execute the second line. Since I have omitted this, I can't do anything (play music, read a pdf file, etc.). Ignoring that my troubles came from this omission, I decided to reboot my computer. Fatal decision!!!!!!!!!!!!!. I could access my fedora. After the introduction of my password, the system loading does not finish.

I don't know what to do and how to do it

Please, Help !!!!!!!!!

Anatole