I am guessing you were hacked when you were running v4.2.1? It is easier to get it back running under the same environment only clean.
You might have the files loaded in an incorrect area -- vbulletin would display the error you are receiving.
It looks as if those files should be in the ./include' folder not the './' folder,
--------------- Added 10 Oct 2013 at 15:43 ---------------
If the contents were incorrect being a bad version or malicious code you would have received this warning.
"forum.php File does not contain expected contents"
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10-10-2013, 09:30 PM
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