I cannot think of a time it has not turned out to be a typo in the registry.
Here is an export of my registry entry for SF10:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\Tools Menu\Sound Forge]
"ExePath"="C:\\Program Files (x86)\\Sony\\Sound Forge Pro 10.0\\Forge100.exe"
"MenuText"="&Sound Forge"
"StatusBarText"="Run Sound Forge"
"Type"="WaveEditor"