Technobabble

Running a Windows 7 guest via VirtualBox on OSX Lion, I noticed that the guest VM would periodically freeze up. The freezes occurred once every few minutes and would unfreeze within half a minute. It was quite annoying and after many months of back-and-forth on the VirtualBox forum, it seems like there is a solution . The solution is to use the Chipset PIIX3 (instead of ICH9) in the virtual machine's motherboard settings

I was trying to install Windows 7 Home Professional (64-bit) on a Virtual Box (4.1.2 r73507) VM. With the default VM setup, I kept getting an Error 0xc0000225 while the Windows 7 installer was starting. After reading some sites that stated that this was likely a BIOS issue, I edited the VM configuration to change the Chipset to " ICH9 " and " Enable IO APIC ". With this change the Windows installer was able to start without errors.