Dear Jim,
thank you very much for your quick reply.
I have a maximum display resolution of 1366x768 and by lowering this , didn't solve the issue.
For downloading GSnap I used another link : GVST.co.uk/downloads.htm, beside other effects, click on GSnap ( pitch correction) and from hereon you are able to choose 32 or 64 bit
( I choose 64 bit for my windows 64 bit, but didn't work ; I tried also 32 bit, but software refuses to work at all )
I also send an email to the maker of GSnap and waiting for reply

thanks again for your hints and time
kind regards, Jay Twostone
music at:https://jaytwostone.com/