As the size of hard Drives increase, more people are using partitions to separate and store groups of files. XP and Vista etc uses the C:\Program Files directory as the default base directory into which new programs are installed. However, you can change the default installation drive and/ or directory to your specified drive by using a Registry hack.
Run the Registry Editor by typing regedit in RUN.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
Look for the value named ProgramFilesDir.
By default,this value will be C:\Program Files. Edit the value to any valid drive or folder and Operating System will use that new location as the default installation directory for new programs. This tip can be extremely useful if you don’t want to clutter your default drive where Operating system is installed.
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