If you're having trouble installing the Symantec Endpoint 11 client on a machine that was previously running Symantec AntiVirus server components you may have have to clean up the Windows Installer entries.
You may run into problems if you run the Symantec Endpoint 11 Manager on the same machines as VMware server. Luckily there's an easy workaround...
Links:
[1] http://www.techniquemicro.com/content/symantec-endpoint-client-installation-issue
[2] http://www.techniquemicro.com/tag/endpoint
[3] http://www.techniquemicro.com/tag/installation
[4] http://www.techniquemicro.com/security
[5] http://www.techniquemicro.com/software
[6] http://www.techniquemicro.com/tag/symantec
[7] http://www.techniquemicro.com/content/vmware-vs-endpoint
[8] http://www.techniquemicro.com/tag/sep11
[9] http://www.techniquemicro.com/support
[10] http://www.techniquemicro.com/tag/vmware