I thank you all for your help
I asked the question on the site of centos and got this:
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Anyway, vmware-server should always be the base and other machines
running as guests inside ... If you need two terminal servers ( a
linux based one with ltsp and the other one with M$ TSE) you need to
know that such machines are cpu (and memory even) intensives. so don't
forget to at least put a lot of memory inside the machine, or divide
the load on 2 or more physical machines ...
Otherwise, vmware-server installs very quick on CentOS, you don't even
have to compile the network modules, since vmware support rhel and so
centos ....
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So as I understand, you have to install first VMware -server and above
it,as guest, the OS's you need.
Centos is a good base for Vmware applics and I hope Stable.