Issues with coldfusion integration

Hi there, hope you can help.

I am having issues getting the finder to start with coldfusion backend. I have the editor and the finder in a folder on localhost, and the finder is tied in fine and the browse button visible.

When I click browse, two things happen:

AVG warning pops up saying that ckfinder.js is a virus
A windows pop up appears asking me to sign into http://localhost

There is no username or password for localhost, it's a windows platform.

Please can you assist, am I doing something wrong with the BaseURL, currently:
config.baseUrl = "/userfiles/";
config.baseDir = APPLICATION.CreateCFC("Utils.FileSystem").resolveUrl(config.baseUrl);

Have tried many different versions for the base url all fail in this manner. Is this an issue with the Application files or security, have you come across this before?

Thanks

Mark