Thank you very much everybody for your scarce input!
I HAVE SORTED THIS OUT

Special thanks goes to b4d_bl0ck for winding me up, but you could be nicer and more helpful, but anyway thanks to you i have sorted this problem and i have been wrestle with it for 3-4 days and nights.
Special thanks to SaThaRiel for your answer THANKS A LOT!!!!!!!!!!!!!
If anybody have same problem, this my solution:
1) as i installed VBox from repositories i firstly uninstalled it.
2) i went to package manager and installed
linux headers 3.8.0-30-generic3) i downloaded
VirtualBox-4.3.8-92456-Linux_x86.run from VBox website and changed permissions of this file to be executable.
4) tahan go to download directory and run in terminal
sudo ./VirtualBox-4.3.8-92456-Linux_x86.runVerifying archive integrity... All good.
Uncompressing VirtualBox for Linux installation............
VirtualBox Version 4.3.8 r92456 (2014-02-25T18:06:15Z) installer
Installing VirtualBox to /opt/VirtualBox
Python found: python, installing bindings...
Building the VirtualBox kernel modules
VirtualBox has been installed successfully.
You will find useful information about using VirtualBox in the user manual
/opt/VirtualBox/UserManual.pdf
and in the user FAQ
http://www.virtualbox.org/wiki/User_FAQ [nofollow]We hope that you enjoy using VirtualBox.