Hello,
The basic default setup should have given you what you are looking for in regards to
no authentication. If you are only using WWW proxy, then perhaps you may wish to disable the NAT feature of WinGate as other internet enabled applications could connect via NAT. In GateKeeper go to System tab, Extended Networking and click on the General Tab and under Options uncheck
General Purpose Internet Sharing(NAT).
If you haven't done so already, check out the Qbik knowledgebase
http://support.qbik.com/index.php?_a=knowledgebase .
Hope this helps.