First off welcome to the boards, but you are going to need to provide a bit more info than what you gave us. What are you trying to install? What security are you looking at? A bit more detail would go a long ways.
VMware has loads of excellent documentation that describe installation procedure and how to configure security. Another excellent resource is Texiwill's book
Edward L. Haletky author
'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education
before we can answer your questions we need a little more information, for example what VMware product are you thinking of utilising?
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VMware Communities User Moderator