XP, Vista or Win 7?
If this is Windows XP, goto http://www.dougknox.com/xp/file_assoc.htm and find his "EXE File Association fix". Download that, and read his instructions for using it.
It should re-associate Windows .exe files correctly.
Do not use Registry Cleaners!
Mark
My PC (an aspir 1 its an acer) does not recognize rundll or .exe files i am trying o download and run a registry cleaner but all that i have found are .exe files hence my problem can anyone tell me how to fix this? Bear in mind i am a novice i know the basics and a little more than that so please be gentle.... Any help would be greatly appreciated....

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