Windows 7 remembers folder view settings for each specific location.
In Libraries, all folder view settings are shared in all subfolders in that particular library.
You would want to open your Documents folder directly from the C:\User\(user-name)\My Documents
location instead of from within the Library location to be able to have separate folder views. A workaround for this is to open your My Documents folder, and any other user folder, from within your Start Menu Personal folder button set to display as a menu
instead of the My Documents button in the Start Menu. Opening it from the Personal folder button will open it directly to the C:\User\(user-name)
location instead of from the library location.
Hope this helps,