As the Hard disk sizes are increasing we are using Partition system in our Operating system.As when we install any program in our computer it automatically assigns
“C:\Program Files” directory for installation. This causes a lots space problem in our HDD.

XP 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 by using a Registry hack.

Go to :

- Start > Run

- Type “regedit” (without “”)

- Go to this directory…
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 now XP will use that new location as the default installation directory for new programs.

- Careful on Editing the Registry