Right now, I am running windows 7 32bit on C drive. I want to Install Win 8 64 bit on D drive. Later, I want to remove win 7 from C drive. Then is it possible to move win 8 from D drive to C drive? lol..maybe a stupid question..
You can't actually easily "move" the data. It is possible to swap the drives or change the letters, But the installation will have to stay on the drive it was originally installed on, unless you want to go into using complicated copying methods.
You can install 8 to VHD for testing purpose. If OK, then use partition tool like Paragon to replace 8 to 7.