You'll only be able to move the "My Documents" foler itself, not "Documents and Settings" since this is a Windows System folder.
Once you have moved My Documents over to Drive "D" to access just put a shortcut on desktop.
I would advise against doing this though, and just move the eccess data to a new folder on "D" You could mark it "My Documents_2" or similar & create a shortcut to that. Windows should have a "My Documents" folder for downloads & such.
Either way, it's your call. You can always direct downloads or anything else to anywhere you want on either drive.
My hard drive is has two partitions with C: containing Windows and D: with all my apps and data. I want to move the My Documents folder to the D: drive where I have a lot more space. How do I tell Windows to look for My Documents on the D: drive instead of the C: drive?