As the size of hard drives increase, more people are using partitions to separate and store groups of files.
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 :-
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Start > Run
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Type “regedit” (without “” NOOBS!)
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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.