Why should Vista cause problems with printing double sided, if it scans and prints, it works.
The combined scanners/printers usually copy without needing a computer attached.
To copy double sided, put the master in the scanner, set the number of copies and scan. Then turn the master over and put the copies in to print the other side and scan. Why buy another printer/scanner if you already have one which works. The only thing to be aware of is that some printers print face side up and some face side down.