I followed the steps but still can't drag and drop files to Virtualbox guest OS. I went to Settings, General, Advanced, clicked Bidirectional on both Shared Clipboard and Drag N Drop and i still can't drag or copy anything to the guest OS(Win7). Am i missing something?
Drag and Drop works only for Linux guests (guest: OS on the virtual machine)
Added experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned.
As guitar42697 said, you have to set a shared folder.
I know this is an old question and it's asking about doing the reverse (host is Linux, guest is Windows) but I hope this will help others like myself set up drag'n'drop where the host is Windows and guest is Linux.
In the VirtualBox window with the VM, click Devices > Insert Guest Additions CD image...
It will appear as a mounted CD in the Linux host OS. Follow the steps to install it, then reboot the VM.
Then enable Drag'n'Drop with Devices > Drag'n'Drop > Bidirectional
(you can also choose another option if you don't want bidirectional drag'n'drop)
You may also want to enable Shared Clipboards with Devices > Shared Clipboard > Bidirectional.
Even after installing the virtualbox guest additions image the drag and drop option would not work at all. You need to install the standard Ubuntu packages for that use the three below commands and then enable the drag and drop option from the Menu-Devices-Drag and drop...
sudo apt-get install virtualbox-guest-dkms sudo apt-get install virtualbox-guest-utils sudo apt-get install virtualbox-ext-pack
This post is inspired by how2shout.com.
I believe you must set up a shared folder, so you can drag things from ubuntu, into the folder, and it will appear in Windows 7, and vice versa. as far as I know, you cannot directly drag and drop items into virtualbox
I have a Ubuntu 12.04 guest running under Windows 7, and it happens to me quite a bit, that a shared folder will "suddenly" be "empty" (and/or unaccessible) when viewed from the guest (/media/sf_vmShare). I believe this happens when Ubuntu updates itself, sometimes. The solution is to re-install the Guest Additions, as per the instruction already posted and reboot the guest.