This is also another way to select the install path using your reg editor. Keep in mind that this tweak is at times a bit unpredictable, so do it at your own risk!
1. Navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion
2. Find ProgramFilesDir whose default should be C:\Program Files
3. Change this to whatever directory you wish. I changed it to D:\Program Files for example.
Remember you have to reboot for your changes to take effect.
Sorry to get a bit OT Grumpy
