I have tried this and it works:
xcopy source destination /Y
Just save this in a batch file of course change the directories as you see fit.
Also note that the '/Y' parameter says that if files exist in the destination overwrite them. If you remove it, it will ask you about each file separately.
If you think this isn't good enough you can use robocopy:
robocopy source destination
Again you need to change the source and the destination directories and put the line in batch file.
I have used both and both works 100%. I have a windows 7 home premium 64x.