Try either AVG 8 or Avast. I have both running on different version of X64. Avast on X64 Visat and AVG 8 on  win 7 X64 both are highly known and respected. 
Hi, I am running my vista 32bit & McAfee for over 18 months. I intend to do a clean install vista 64bit and would be ever so greatful for advice on a virus protection. Option one: is to continue with the paid version of McAfee & I wonder if that will support 64bit?                                                               OR Option two: Go for a free virus protection programm that is availabe for 64bit VISTA. If one possible can one direct me in the direction for me to download a setup on to a cd, so that I can install that after my clean install of the 64bit os prior to connecting myself to the internet fully protected. Thanking you.  
What free virus for vista 64 bit?