Finally I sorted out my problem.
It was problem due to dns server address.
I did below steps
- open CMD
- Goto your android-sdk/tools path, Like my path is
G:\Andriod Development\android-sdk\tools
- type this command
G:\Andriod Development\android-sdk\tools>emulator.exe -avd Android_2.3.3 -dns-server 8.8.8.8 -scale 0.75
here Android_2.3.3 is your AVD name, -dns-server 8.8.8.8 will set your DNS address to 8.8.8.8 or 8.8.8.8:55 and -scale will scale your AVD to specified value.
this will start a new emulator. Enjoy :)
Hope may be helpful to others