First of all, the software ProTV itself is only one evolution moreover of the software which is delivered for a long time with the cards tuner NCV of the same name (I have one of them...). It inherits a certain number it of through: not very intuitive parameter setting and little practise, instability chronic and afflicting. Moreover, on my G3/400, which is not certainly any more one top-of-the-range model, but which is far from being exceeded, the display of the chains is jerked. One improves a little the thing by decontaminating the virtual memory and by leaving all the applications in background task (thank you, ProcessWatcher), but impossible, in ProTV to have a satisfactory image.