File transfer problem between Host OS and Guest OS

Hi,
I have WIndows7 32 bit as a host OS in C drive. and i have installed the Virtualbox in D drive and installed CentOS 6 in virtual box as a guest OS.
After installing the Guest Additions in CentOS and set the Drg n Drop-Bidirectional. it permits to create shared folder in CentOS but i am not able to drag n drop to any file from host to guest and vice versa.
Also when i plug the pendrive it copy the partially data in guest OS then it show unpluggeed automatically in guest OS. It copy only .rpm file in guest OS (CentOS)
please suggest how to copy the file from Host OS to guest OS and vice versa.
I have installed VirtualBox-4.3.20-96997. i have installed also Oracle_VM_VirtualBox_Extension_Pack-4.3.20-96996.vbox-extpack on windows ( on host OS).
Thanks.

The following is from the virtualbox user manual:
Drag’n’Drop This setting allows to enable Drag and Drop: Select a file on the desktop, click the left mouse button, move the mouse to the VM window and release the mouse button. The file is copied from the host to the guest. This feature is currently only implemented for Linux guests and only for copying files from the host to the guest.
I guess that explains your experience with Drag'n Drop.
Regarding USB and the pen drive, you cannot access a USB device in the host and guest OS at the same time. The technology does not support this. You will either have to capture the device to be used/mounted in the host or guest OS. Unless you configure the USB device in the virtual machine settings, the device will normally be captured by the host OS and become inaccessible by the guest OS.
To copy files between Windows and a VirtualBox Linux guest you can use Putty and it's pscp.exe to copy files from Windows to Linux and vise versa. You may have o enable SSH on your Linux side. There was a post here yesterday, please check the last forum discussions. Alternatively you can also use WinSCP if you want a GUI tool.

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