Virtual machine (VM)-Run an OS inside another OS

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A virtual machine is a piece of software which allows operating systems to be run 'inside' other operating systems.

Top 4 virtual machine 

1-Virtualbox
2-Parallels
3-Vmware
4-Windows virtual-pc

You can run any OS of your wish windows xp, fedora,windows 7, redhat or backtrack

I am illustrating this tutorial by Ubuntu 12.04 LTS - the current long term support version, released in April 2012, codenamed Precise Pangolin.

Some uses of Virtual machine are:-
 -Try new operating system:- you can try a new operating system without formatting and losing your data.
 -Test your software- You can use VMs to try your software or web app or even site design on a variety of boxes by just building virtual machines and running the tests there. 
Steps To SETUP VM on Windows 7.

1. First head to virtual box website 
2. Download  VirtualBox 4.1.16 for Windows hosts
3. Open VirtualBox.exe and install it.
4. Open Virtual box
5. Click New 

               Then you get this.click>Next 

             
            Give appropriate name, select OS and version.

            

         >Select the amount of base memory (RAM) in megabytes to be allocated to the virtual machine.
            The recommended base memory size is 512 MB.

                

                     >Next 

                         [Note : you can use existing hard disk when you want your VM on another computer           so,just make sure that you take your 'anyOS'.iso and VM hardisk from C:\Users\computer name\VirtualBox VMs\ubuntu ]

                    >Now, Select VDI because it supported by most of the operating systems 

                 >When you get this select how much you want your VM harddisk to be !

                
                     Almost done,click create

                     Then you will get this :

                     Now we will have to mount .iso file so, click settings 

click storage 

Then first click IDE controller the click the CD icon on right side

 Choose the first option-"choose a virtual cd/dvd disk file "

then select the .iso you downloaded .

After that you sholoud notice that IDE controller is changed from "empty" to "ubuntu-12.04-desktop-i386 "

Click ok ,then click the green start arrow 

That's it click install ubuntu !

Done !