VGA resolution with problmes for install PVE 3.1 on PVE 2.3

Hi to everybody
I hope someone can help me

I am trying to install the latest version stable of PVE 3.1 of his ISO Installer on PVE 2.3 for do tests of PVE 3.1 (On PVE 3.1 I will not do tests of KVM)

But the problem is the VGA resolution of the screen of the VM PVE 3.1.
I tried to change into PVE Host all types of VGA emulation for this VM without success, then i can't install PVE 3.1 because i can't see all screen.

Is possible change the resolution of PVE 3.1 since his installation to 800 x 600?

I have in my Workstation:
Win XP SP3
JAVA Version 7 Update 51
Firefox Version 25.0
Google Chrome portable Versión 32.0.1700.107

The resolution of my physical screen: 1366 x 768

Best regards
Cesar