hello everyone,i am a beginner on linux aswell as vm but i did some research about both of them and i find out that i can run both os(windows and linux) at a same time using virtual machine.so i have installed virtualbox 4.2.12 for windows on my windows 7 (amd processor).but i cannot install kali on virtual box.i have tried both i386 image and amd64 iso image but couldnt get it fixed..can anyone help me with this..please..when i tried to install using both iso image file or dvd it shows a starting option like(install,GUI install etc) but when i select any on these it gives me nothing..what i mean is it just shows up KALI LINUX boot up picture and nothing happens..i am a beginner so i would appreciate any tips u guys can provide me to install kali linux on my windows 7 os..thanks