No. Windows Vista does not have AV built in. You need to get a package that
works with Vista. Most of the vendors, such as McAfee, Symantec, Trend, CA,
Sophos, F-Secure, and so on all have AV that works with Vista now.
> I have just recently Upgrade my Windows XP home Edition to Windows Vista
> Premium. Installation everything is fine. But my problem is my AT&T Yahoo
> Antivirus is turn off automatically. Is Windows Vista have Anitvirus on it? Is
> it okay to leave it off my AT&T Yahoo antivirus off?