Ports 80 or 443 SSL already in use. XAMPP Error

Hi Dears,
I am using Windows 7 Ultimate. Now i try to install XAMPP software at this operating system but when i install it then i receive below error. Please tell me how can i solve it. Tell me with screen shots so that i can understand solution easily.
If you know proper answer and can tell me in easy steps only then give me answer.
Regards,
XAMPP 1.7.7 win32
Ports 80 and 443 (SSL) already in use! installing apache 2.2 service failed!
