Nearly all the guitar simulators I have tried have crashed my pc. Amplitube, Green Amp and all the other free ones. When I apply them to more then one track, I start to hear cracking and pops, and after a short while my pc usually freezes. This also often happens when I use other plug in Cubase SL. I recently installed Amplitude Live on my pc, but I only get wired pops and crackles when try running the program. Im using Windows XP, and have a M-Audio Soundcard. I have installed all the latest drivers, and increased the buffer size, but nothing seems to help. The strange thing is that this happens on both my pc'es. Im using the same soundcard for both of them, could that be the cause of the trouble?