VMware Workstation 4Features | Documentation | Knowledge Base | Discussion Forums
If your Windows guest operating system is set to a display resolution larger or smaller than the size of the virtual machine window, you can make it fit exactly by choosing View > Fit Guest to Window.
When you choose Fit Guest to Window, VMware Workstation adjusts the display settings of your Windows guest operating system as needed. If you subsequently run the virtual machine in normal mode, you may want to change the display settings back to their previous values.
Note: When you use the Fit Guest to Window option and the window is small, your guest operating system's screen resolution may be set to something smaller than VGA (640 x 480). Some installers and other programs do not run at resolutions smaller than 640 x 480. If either width or height is smaller than the corresponding dimension required for VGA, the programs refuse to run. Error messages may include such phrases as "VGA Required To Install" or "You must have VGA to install."
There are two ways to work around this problem.