Due to some conflicts which came about in my Windows 7 64bits pc I understood the combination of Comodo Internet Security-inclusive of AV,D+ and PrevX 220.127.116.11 beta 64bits paid could perhaps give raise to occasional conflicts which in my case damaged Paragon backup software (thread in Paragon sector). As a matter of fact twice a BSOD came about,the first time WhoCrashed explained the dump as the work of cmdguard.exe, the second was a ntfs thing. So I decided to get rid of the AV part of CIS, as I reasoned the 'Boclean' part might have interfered, and I downloaded Avira free installing it without any heuristic Guard or Shell ext. So now I run Prevx full blast and I make frequent scans with the antivirus, having of course the firewall and HIPS part of Comodo running all the time with max settings. Asap Superantispyware 64 bits will be ready and I will add that to the on demand programs. The speed of the machine has increased noticeably with the elimination of the AV,adding more speed to an already fast OS. Anyone thinks this approach is wrong or inadequate to fully protect please let me know.