Squid authentication with logged on user possible?

[topetry]

Dear all,
i've set up pfsense 2.1.1 with squid 2.7.9 and lightsquid 1.8.2. Proxy authentication with our Win 2008 R2 DCs is working and logging works as intend but users need to authenticate with their domain account when they open the webbrowser the first time. Is there a solution to avoid the popup authentication prompt and simply use the logged on user? All clients are Win 7.

[jimp]

It's been covered on here before a few times in other threads. Try searching for squid and NTLM and similar topics.