Go to start>run and type in regedit and hit enter.
Navigate to this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppPaths\MSCONFIG.EXE
In the right pane, right click "default" and go to Modify. Change the path to the directory that you found msconfig.exe in, for example C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe then click Ok.
That should do it for ya.
