Rundll32.exe not found!!??

Pretty much just how it sounds. I was working on a computer that had been infested with viri and the entire control panel was kaput. Every time I tried to open up a system app(cmd.exe, msconfig, help and support) I would get the "rundll32.exe not found" error. After fighting and fighting, I found a solution. It seems this is a registry issue, so I followed the instructions here to

Simply follow the bellow step... ur problem will be solved
Try it.Click Start, Run. Type command and press Enter. Type notepad and press Enter.Notepad opens. Copy all the text below into Notepad.
Code: Select allWindows Registry Editor Version 5.00[HKEY_CLASSES_ROOT\exefile\shell\open\command]@="\"%1\" %*"


Save this as fix.reg to your Desktop (remember to select Save as file type: All files in Notepad.)Double Click fix.reg and click YES for confirm.Reboot your computer. 

Worked like a charm.