AV TEST has listed security products they have reviewed for Windows 8 as noted in link below
QUOTE: The following security products are already compatible with Windows 8 (32 and 64 bit editions). This overview will be updated on a regular basis as soon as new information gets available. Last update: October 18th, 2012. Products on the list have been carefully tested by their developers, are fully supported by their vendors and reviewed by AV-TEST in the areas of Protection, Repair and Usability. Only final and released versions of the products are included. Beta versions or release candidates are not considered. However, not all products are supporting all new Windows 8 features (like the new user interface) yet.