I have been using VMware for years but it’s not free in mac, so I switched to Virtualbox.
You may encounter the following errors when installing 64bit windows 7.
- Unexpected error when starting to install. Fixes: Enable IO APIC in VM Settings/System.
- Audio controller not properly installed. Fixes: Download and install the latest AC97 Audio Driver from Realtek. Windows may keep prompting you that the driver is not verified, confirm anyway.