I have had trouble with AMD not with performance, but the chips have little tolerance for poor-quality components (like the power supply).My Athlon would constantly crash, but with an upgrade to an Antec 300W power supply, my problems went away.
You may be under-powered, yes, some applications may make calls to the system for more resources than they really need and cause the system to crash if it is already unstable.
If the power doesn't fix it, go to catchup.cnet.com and they'll automatically give you every update you need.