missing screen resolution mode

What do you mean by the right mode? You were not able to select 1280x800 in your guest?

Replying to frank:

What do you mean by the right mode? You were not able to select 1280x800 in your guest?

yes

there is only a 1152x864 then 1280x960 and then 1280x1024 option but i need 1280x800

This version was not neither available in 1.6.0. Such a mode can only be added if you do

VBoxManage controlvm "VM_NAME" setvideomodehint 1280 800 32

while the VM is running. The dimensions of that video mode are stored as long as you don't select another video mode in your Windows guest. Please refer to section 8.7 in the user manual.

Please note further that you can resize your guest window with the mouse and that this video mode is kept in the same way as the video mode hint. Same with the fullscreen mode (HostKey? + F).

Replying to frank:

This version was not neither available in 1.6.0. Such a mode can only be added if you do {{{ VBoxManage controlvm "VM_NAME" setvideomodehint 1280 800 32 }}} while the VM is running. The dimensions of that video mode are stored as long as you don't select another video mode in your Windows guest. Please refer to section 8.7 in the user manual. Please note further that you can resize your guest window with the mouse and that this video mode is kept in the same way as the video mode hint. Same with the fullscreen mode (HostKey? + F).

Thank you very much now it's ok

but believe me until 1.6.0 version i had to do nothing and resolution fitted automatically to my notebook. I had never to deal with dos command until this time.