Actually.. Theres a license file for VMware workstation. And with that licensed copy.. you can make as many virtual machines as you want. As long as you have the RAM and hard drive space to hold them on your own computer.

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PC 1: eMachine; OCZ f4ta1 4GB RAM; nVidia GeForce 9600GT(512MB) Overclocked Edition;WD 250GB HDD; Samsung SyncMaster 720n PnP Monitor; Silverstone 1000W PSU; Dual Core CPU clocked at 3.5GHz.

Laptop: Dell Studio 15; 3GB RAM; 250GB HDD; ATI Mobility Radeon 3560HD(256MB RAM);Intel Core 2 Duo T6600 (2.2Ghz/800Mhz FSB/2MB Cache)