I haven't been following anti-virus market for years, so not really knowledgeable about current offerings. What I am looking for: anti-everything (it seems antivirus, antimalware, antirootkit are now often different products) with highest ON DEMAND detection rate. My main target OS is Windows 7 x64, secondary are Windows Vista 32 and Windows XP 32. I would prefer single product but will consider multiple as well. Doesn't have to be free but has to satisfy criteria I will list below. I will not use real-time protection at all (I have seen enough cases in the past where it would conflict with legitimate software and was really difficult to find out it was AV causing a problem). So it is required that I am able to turn real-time protection off completely. Ideally software wouldn't even load unless started on-demand. I think it would be great if I could boot it from CD or flash drive (should be better for rootkit detection?) but I don't know if something like this even exists. I would like it to work at OS level as opposed to taking over whole computer. That is I don't want another software firewall, plugin for each internet browser to analyze web pages, etc. I would like something that is easily and completely uninstalled via control panel without leaving any pieces behind and breaking OS. I think this about covers it.