Running Arch in Virtual Box --- Cannot expand resolution.

I have ran the "xdpyinfo | grep dimensions" command on the virtual machine and got the output
"dimensions 800x600 pixels (452x277 millimetres)"
I then ran "xdpyinfo | grep "dots per inch" command inside the virtual machine and got the output
"resolution 45x55 dots per inch"
But on the host machine the values are obviously different and show the following from the same commands
  dimensions:    1680x1050 pixels (444x277 millimeters)
  resolution:    96x96 dots per inch
Basically i would like to change the resolution of my virtual arch machine to the same size as the host machine. Could there be a .conf file where i could change these values?
Thanks
SlashWannabe94

I have been reading some documentation and have created the /etc/X11/xorg.conf file and added the following code to it.
Section "Screen"
        Identifier "Monitor0"
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes "1024x768" "1680x1050"
        EndSubSection
EndSection
I have also edited the /boot/grub/menu.lst and added the following code to it.
# (0) Arch Linux
title  Arch Linux
root   (hd0,0)
kernel /vmlinuz26 root=/dev/disk/by-uuid/494bc5ad-ee41-4ab7-acea-4612ab22b5ae ro vga=773
initrd /kernel26.img
Yet i still cannot change my resolution.

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