Cubase 6 erratic


When i load a first vst plug-in instrument all is ok, but on loading a second one after a few minutes play on my keyboard controller,my pc becomes erratic with crackling sounds and if i continue to play further,it crashes.I checked my cpu performance,its 100% all the time and memory is 2.35 gb.

It was working fine sometime ago

I have my pc with Intel Core Duo 2.67GHz
Installed memory 4gb
M audio midi controller 61es
M audio Firewire 1814 sound card
Display adapter ATI Radeon HD4600

Any help please.Thanks


Do you use Windows or Mac OS X? Which version? Is your system optimized? What about background processes? Can you check it? Isn’t here any very CPU load application in background?

Is your Cubase 32-bit or 64-bit? What plug-ins exactly do you use?