i have installed xampp server in my pc.i couldn't run programs in browser.when i write http//localhost
then it screen comes with written iis7.please help
Have you installed Apache and started it? If you're not using IIS, you can turn it off.
Here's how to turn it off: http://forums.iis.net/t/1150139.aspx?how+to+turn+off+iis+7+
To add on to @diafol's comment:
Might be a good idea to change the port if you use IIS.
After instalation, there will be a xampp control panel, the Apache should be started before localhost can be accessed.