If you want to install PlanetSide to an alternate location you have a few options.
This requires registry changes not for noobs.
1) Go to Start > Run Type "Regedit"
2) Find the key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\App Paths\LaunchPad.exe\
3) Change the ones that are incorect to your setup
This requires changing environmental settings - experts only.
1) Go to Start > Run Type "cmd"
2) Type in "set c:\program files\sony\planetside=your new location"