my config is just the 3rd part of processing power and runs VC stable

so, your PC's system performance shouldn't be the reason ...
most common problems within the config are:
-> that a USB cable - shielded with a ferrit core - is definitly recommend
-> and also you should check your audio and data I/O routings
-> also flash both virii to same OS (else VC won't be compatible with one of them)
i don't think there is any difference of VC's stability between MAC and PC.
... it's probably just a matter how the whole config was setup ...
try some different setups of I/O routing until you get it stable.
you can tweak them in VC's *common* tab ... under *output*
have had similiar problems in the beginning and was a bit
disappointed until i figured out where the glitches coming from.