JSI Tip 1859. How can I change the default application install from '\Program Files'?

Use Regedt32 to navigate to:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current Version

Double click the ProgramFilesDir value name and change the path in the String Editor.
Double click the ProgramFilesPath value name and change the type REG_EXPAND_SZ data value in the String Editor.