I was looking GW-Basic for Windows 7 (64 Bit) but I could not find a compatible version.
After searching, I came to know about QBasic that would be used for GW-Basic programs.
Please help me set up the environment for GW-Basic.
Have a look at PC-BASIC. It's a free implementation of GW-BASIC that runs natively on Windows 7 (as well as Linux and Mac).