Listener service is not starting after installation of Oracle server 11.2 software

Today i had installed Oracle 11g release 2 version on my system and found that listener service is created but not able to start(..giving an unusual error like some services stop automatically if they have nothing to do).

I have followed the below steps to solve this..

1.) Tried executing the listener service manually by running D:\app\Vishwanath\product\11.2.0\dbhome_1\BIN\TNSLSNR.exe 

2.) I found the message "ORACLE_HOME not set".

3.) I immediately set the same in Environment variables by going to My computer-->Properties-->Advanced.

4.) Took a restart of the machine.

5.) Tried restarting the listener service again and this time successfully started.

:-) Enjoy