You can 'hard wire' the screen resolution instructions with RDC.
1: Right click the RDC icon and select 'Open with Notepad'
2. Edit the settings:
screen mode id:i:1
use multimon:i:0
desktopwidth:i:1440
desktopheight:i:860
session bpp:i:16
3. Save
4. Run the RDC
Additional Setup instructions can be found here: