I was wondering if anyone else experienced this issue and has knowledge on how to fix it. I am running an AMD Phenom 9850 Quadcore under Ubuntu Lucid 10.04.
Problem: Running my old Windows 98 SE in virtualbox and CPU Frequency left alone at "On Demand", when Windows 98 SE begins to reach desktop, my CPU would spike up one core and beep, then shut down my whole system (Native), not just the virtual machine. All other windows XP and above runs just fine without a problem. I gave Windows 98 SE Virtual machine 512MB ram, tried with 2d and 3d hardware acceleration both enabled and disabled.
Work Around: My only work around now is to force my CPU frequency to run at 1.25Ghz (all 4 cores because don't know which one will spike at random) from the Native Ubuntu Lucid CPU Frequency monitor.