By defaut IIS will not be enbled in windows 7 ultimate but it will be installed along with OS. So in order to use IIS we need to enable it. There is no need to install anything just follow the below steps.
Go to All Programs -> 'Turn windows features on or off' and then select 'Internet Information Services' and clock ok.
This will enable all the iis services on ur machine. While selecting, if you expand the 'internet information services', many options will be displayed like FTP Server, etc.. Based on our need we can enable appropriate services.