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I deleted and re-uploaded, and got the same problem. However, now that I did what you suggested with line 98, when I click the 'Administration Menu' link I get to a blank page saying 'Selected module does not exist!'. I re-checked and I do have a system folder in /modules, especially considering that I can access admin.php via direct link.
Maybe a re-upload of the modules folder is in order?
~TCMTCM