Program files,32bit & 64bit?

Today,I've installed 64bit version of windows 7 for first time ever,and I see that I have 2 Program Files folders in C partition(beside Program files in D partition ),Program Files 32bit&Program Files 64bit.
Is that normal,or maybe I have messed up something when I was making another partition.
And another question,if that is alright,then I'm suposed to install 32bit programs in Program Files 32bit folder,and 64bit programs in other folder,or Win7 do it by default?

LOL, nothing to worry about.
I believe in Windows 64-bit, it installs a component called WoW (Windows over windows, or something like that) that allows the OS to run 32-bit applications.
Windows seperates all your program files, based on whether they are 32- or 64-bit.

When you install a 32-bit application, in my experience, it will always auto-detect your C:\Program Files (x86) as the default folder to install.
The opposite goes for 64-bit apps, it just installs in the C:\Program Files folder.

Windows 7 does this by default, I believe Vista also did this in the 64-bit flavours.
Nothing "messed up", its the default behavior.

Hope this cleared it up.

Yes,it did.First time ever,like I said.
Thank you very much