Virtualization only enables 64 bit virtual machines to be run as guests inside VMware or VirtualBox. If the host OS is bluescreening after you simply install VMware or VirtualBox, it's likely that there's some part of the program the system doesn't like (the network adapters that VMware installs come to mind). First try reinstalling the apps, but don't have both installed at the same time. Remove both, then reinstall one and see if it works. If not, remove it and reinstall the other.