Browser asking username & password

problem of asking to type username and passoword for http://localhost. try this solution as mentioned below :
1. Open firefox and type in the address bar about:config
2. type ntlm in the textbox.
3. Double click on network.automatic-ntlm-auth.trusted-uris and type localhost there.
4. Click on OK.

You are done.
for Internet Explorer follow these steps:

The Log in Pop up is due to a setting in your IE Browser.
In your IE Browser:
1. Go to the Top menu "Tools" -> "Internet Options".
2. Then choose the "Advanced" Tab.
3. Then Scroll all the way down and "Uncheck" the Checkbox corresponding to "Enable Integrated Windows Authentication".
4. Then Click the button that says "Apply" and then "OK".
5. Close the browser and in a new browser try http://localhost.

for IIS SERVER  follow these steps:

1.start->run-> type inetmgr 
2 click on .internet nformation services-->Local Computer-->web sites-->default websites->right click and goto properties
3. select Directory Security Tab-->under anonymous access and authentication control --> click on edit button.
4.Check The Anonymous Access->ok
or
4. uncheck the Integrated Windows Authentication--.> ok-->ok

thats it ! u r done