by David Hakala

Q: How do I fix the error: rundll32.exe is not a valid win32 application? — Ashok

This error message is a sure sign that your computer is infected with malware of some kind. Something has replaced the valid rundll32.exe file with an identically named file that does who knows what. Whatever did it is probably hiding somewhere else on your machine, waiting to do it again if you simply replace rundll32.exe with a clean copy from your Windows installation CD.
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