In Windows 7, there are two applications folders. Presumably the same as in Vista (which I have never used), as reported at [http://www.nvnews.net/vbulletin/showthread.php?t=87478]:
- Program Files = 64bit apps
- Program Files x86 = 32bit apps
- If the installer is a 32bit application, it will install it to the x86 directory. If it’s a 64bit application it will install it to the regular one.