Play Childhood Dos Games in windows7 or Vista

Now-a-days we are usually using windows7, vista instead of using windows 98 or 95 which is not user-friendly but our Childhood games such as : DAVE , MARIO , STREET FIGHTER were only available there.
We cannot leave the advance operating system neither can leave our Childhood memories.
To live the childhood again this is a small step :)
Yes, it’s now possible to play the Dos games in your Windows 7 & Vista.

Angry Bird Space (PC version- Windows)

Angry Birds Space launched on March 22, 2012.

DESCRIPTION:

After a giant claw kidnaps their eggs, the Angry Birds chase it into a wormhole and find themselves floating in a strange new galaxy – surrounded by space pigs! Luckily the Angry Birds have super powers of their own...

AnGry Birds :) 

Some familiar birds from previous versions are dressed in sharp new space gear. And some new birds are also available here with previous birds having new power.