Thank you Bob.
I just send a system info to cakewalk support.
WaIting for their assistance.
I will inform you.
I did all the things you suggested and from cakewalk they told me that everything came out from this thread was a good advice.
Then I say thank you and everybody for this help.
I really appreciate.

Hi everybody. I tell you the happy end of this. This was possible for the analisys of Cakewalk support team that I thank very much. 1. Karpersky was set not to scan anything about Cakewalk. Anyway I unistalled it and deactivated Windows defender but with no result. 2. I never realized that Ge force graphic card install 2 devices (depending on the bios settings). I deactivated Nvidia Nforce 980a/780a Sli, keeping active only GeForceGT9400 and dropouts became very, very unfrequent. 3. Also the remote control of Pro Channel caused drops. Not any more after the changes to the Graphic processor settings. So thank you for the support. I don't understand why the GUI was under stress, working on prochannel modules, knobs and borders and was very stable with dual screen, mixer view opened, track view and virtual synths page. Maybe the future release of quick fix will balance the GUI stress... Don't know and would like to hear your opinion about. That's all folks for now. Let's play music then!

Hey - glad you got some relief on this and that you are back to making music.

Bob Bone

For whatever the worth, I use a free antivirus program called Avast.  One of the reasons I use it is that I can temporarily turn it off/on as needed without having to uninstall it.  It also takes up a small memory footprint and does not seem to bother anything while it is doing its thing.  Also rated highly and I have never gotten a virus with it.

Just a thought since you had uninstalled the one you were using.

Bob Bone