I have Ubuntu 10.04 OS and a virtualbox (not the OSE) with windows XP as a guest.
When I choose Full screen in virtualbox the operating system (my guest, windows XP) is still in small screen.
I installed the guest additions. However, if I go to Devices on the Menu, it still shows "Install guest additions" like they were not installed. I can only choose 800×600 and 600×480 resolutions.
I'm using VB 3.2.8.
These are my settings:
General
Name: windowsxp
OS Type: Windows XP
System
Base Memory: 512 MB
Processor(s): 1
Boot Order: CD/DVD-ROM, Hard Disk
Display
Video Memory: 24 MB
3D Acceleration: Enabled
2D Video Acceleration: Enabled
Remote Display Server: Disabled
Storage
IDE Controller
IDE Primary Master: windowsxp.vdi (Normal, 10.00 GB)
IDE Secondary Master (CD/DVD): VBoxGuestAdditions.iso (32.01 MB)
Floppy Controller
Floppy Device 0:Empty
Audio
Host Driver: PulseAudio
Controller: ICH AC97
Network
Adapter 1: PCnet-FAST III (NAT)
Serial Ports Port 1: COM1, Disconnected
It looks like windows XP is using the VitrualBox Graphics Driver (Device manager > Display adapters : VirtualBox Graphics driver) It just doesn't show in full screen mode..
Best Answer
Gues additions seem to been installed correctly.
Can you give your graphic card 32 Mb of memory. It's the only difference that I see with my setup that does work correctly in fullscreen or seamless.
How to check if video guest additions are installed
Looks like guest additions have not been correctly installed. Check that windows is using Virtualbox Graphics Adapter as it's display driver. If it isn't try to reinstall the guest additions and report back any problem that it displays.
You can check it using the Device Manager on windows. If you are using XP, you can reach it this way:
Other windows version have it placed in another places, but it's always there ;).