YUM/RPM do not work at all in Centos 6.3 x64 bit edition

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http://forums.fedoraforum.org – Ok, I messed up my yum/rpm utilities in Centos. when i try running either or, with any and all files or options, i receive the following errors every time: yum: There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: libdb-4.7.so: cannot open shared object file: No such file or directory Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.6.6 (r266:84292, Sep 11 2012, 08:34 (HowTos)