Change default installation path [Windows 7]

How do I change the default install/common files path in windows 7?
It's default is: C:\Program Files & C:\common files

I've done this before several times in xp en vista, using this edit in regedit:

Change the settings in this registry key: HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion

From C:\blablabla to whatever drive you want, D: in my case.

My problem: This doesnt work in Windows 7...

Who knows the solution?

Thanks a million!

I would also be interested in doing this.

The way, that you described seems to work on the 32-bit Windows7,
but not on 64-bit Version because there are two Versions on "regedit.exe" there.

The Solution is, to change the registry in the second version either:

1.) Enter into Start>Run: %systemroot%\syswow64\regedit
2.) Go to: HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion
3.) Change the Path in DWORDs ProgramFilesDir, ProgramFilesDir (x86) from "C:\Program Files (x86)" to your own.

I did the above and it worked fins using the 64bit regedit, however, program installer opens, It installes to the dir i changed it to "E:\Program Files\", but once installer is finished i can not open the prog via its icon either from the desktop or from the start menu, I veiw the Icon properties, and find that the target is still "C:\Program Files (x86)\...." I correct it and everthing works fine, But its a pain, and I can not find anywere else in the registry to change the %ProgramFiles(x64)% Variable, witch im assuming is causeing the issue, and there are no entries for this varable in Sytem properties.... can anyone help?!