I have installed ant(apache-ant-1.7.0). But when i run the ant command in dos command prompt, it says
‘ant’ is not recognized as an internal or external comm
Don't use Windows GUI for creating environment variables because they can mess up with the system. Easiest and best way to create a variable is creating them as local with a command script. This way they will be local and won't interfare with your system, and easier then using GUI :)
Open up a blank notepad, type the following (in case you are interested in building a Java project I added a JAVA_HOME variable as well). Replace the ant and jdk paths with whatever is correct for your machine
set PATH=%BASEPATH%
set ANT_HOME=c:\tools\apache-ant-1.9-bin
set JAVA_HOME=c:\tools\jdk7x64
set PATH=%ANT_HOME%\bin;%JAVA_HOME%\bin;%PATH%
run the script and check the location with echo %ANT_HOME%.