WampServer

in wamp... when i click on apache to test port 80... its shows
" your port 80 has been using by "... then blank

when i open wamp server my port 80 originally use by httpd.exe and there are 2 images of this process in task manager..

is httpd is wamp proces?? or is that blocking/or using port 80

i also change the port from 80 to 81 in httpd.config and run web address as localhost:81...
again the browser loading the localhost....

any solution.......... is there any malware virus ( as i already scan and no virus found)