unfortunatly, my windows doesn't accept 64 bits.... thanks for explanation..this is so, arctefacts! but i'm still surprised a such great and expensiv camera bought by professionnal and perfectionnists personns have this kind of big problems...for me it's a big problem..i have almost sold my P45+ because of this!
Situations like this illustrate of why working with a knowledgeable dealer can really pay off and save you headaches.
The alternative to these artifacts (before v7) is an AA filter in front of the sensor that reduces sharpness. If you've ever wondered why, at 100%, a Canon/Nikon file does not appear as sharp as your P45+ files it is because of a combination of this AA filter, the lens quality, and the extent to which the raw processing is catered to make the best final image. So all else being equal I'd much rather have no AA filter.
Now with Capture One v7 you get the best of both worlds: the fine detail and sharp rendering of a sensor without an AA filter, with minimal artifacts.
Re: your computer not being able to run 64 bit... Even an entry level Mac Mini
, or baseline Dell would provide you a system which would run 64 bit Windows, Capture One v7, and in all likelihood would far outperform your current computer. I think you'll find many more professional software packages which require 64bit in the coming year or two, so now is probably a reasonable time for you to upgrade. I know it kind of sucks that we have to upgrade our computers every several years, but that, frankly, is the reality of the situation.