If you have had trouble with installing Windows 8 or Windows Server 2012 using VMWare Workstation 8.x in the past, fortunately VMWare has just recently released VMWare Workstation 9!!
VMWare Workstation 9 offers full support for Windows 8 and partial support for Windows Server 2012. It also has significant performance improvements over its predecessor--Workstation 8.
Check it out--it is well worth the upgrade!!