Are you trying to virtualize a boot camp installation or convert a separate physical install (i.e. on a PC) to a virtual machine?
If the latter, converting physical machines to virtual always results in a bloated, buggy, unstable virtual machine - you're always better off building a VM from scratch. But if you want to try, use the standalone VMWare Vcenter converter, and make sure you convert both hard drives, not just one.
If doing this via a boot camp installation, maybe someone else can chime in.