After reading comments on different forums, I conclude that I need a 'Guest Addition' of VBox. So I have started to install the Guest Addition for my VirtualBox-OSE. I follow the same steps as mentioned on forums to install the guest version but always gets the following error messages:
Could not find the VirtualBox Guest Additions CD image file /usr/share/virtualbox/VBoxGuestAdditions.iso or /usr/lib/virtualbox/additions/VBoxGuestAdditions.iso. (i.e. it cannot able to find 'VBoxGuestAdditions.iso' file) Do you want to download this CD image from the Internet? And then it returns 404 :s
Now on one of the forum I found different information related to VirtualBox Editions: "There are two different Editions of VBox: PUEL and OSE. PUEL has a lot richer functionality but is available from proprietory Sun repositories. The GA are bundled this as an ISO. In the OSE version the GA are typically available as a separate virtualbox-ose-modules package."
The next thing that I have done is to uninstall the VirtualBox-OSE right away. I have downloaded the PUEL Edition of VBox and installed it. Now I have got the PUEL Edition, I can install the 'Guest Addition' on this VBox. The missing file 'VBoxGuestAdditions.iso' is now available in the folder. I doesn't have any issued in installing the guest addition after that. And finally have some rich features in my VBox.