In order to use dual monitors RDP for a Windows 7 vm guest:

1. You will need to first download RDP Version 7 (if you are not running version 7)

2. Your VM guest must be running Windows Server 2008 or Windows 7 Ultimate  or Windows 7 Enterprise.

NOTE THAT MULTI-MONITORS RDP DOES NOT WORK ON WINDOWS 7 PROFESSIONAL.

Before RDP version 7

After Installing  RDP version 7

The Remote Desktop Client Version 7 can be download here:
http://support.microsoft.com/kb/969084
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=20609

Related Links
http://serverfault.com/questions/284667/two-monitor-in-one-vm
http://blogs.msdn.com/b/rds/archive/2009/07/01/using-multiple-monitors-in-remote-desktop-session.aspx

First

Download Putty and Puttygen.exe : http://www.chiark.greenend.org.uk/~sgtatham/putty/

Second

Follow the directions that are on the following website http://www.codelathe.com/blog/index.php/2009/02/20/ssh-without-password-using-putty/

or

http://www.howtoforge.com/how-to-configure-ssh-keys-authentication-with-putty-and-linux-server-in-5-quick-steps

Note: 
1. The authorized_keys file content should start with the "ssh_rsa" keyword followed by a space.
2. The mumble-jumble characters of the public key should be on one line (right after the space).
3. Sometimes the default home directory of a user is changed to a different path make sure that you add the .ssh and authorized_keys to the new path.