The method : "com.dell.plugin.Dell Management Plug-in" was applicable to appliance version 1.7 and below. For versions after 2.0 and above, use the following steps :  1.  Enter http:// /mob . 2.  Select the content link. 3.  Select the ExtendManager link. 4.  Select the UnregisterExtendsion link. 5.  Enter the extension key to unregister : " com.dell.plugin.OpenManage_Integration_for_VMware_vCenter_WebClient " and click InvokeMethod 6.  Enter the extension key to unregister : " com.dell.plugin.OpenManage_Integration_for_VMware_vCenter " and click InvokeMethod 7. In the vSphere client, power off the plug-in appliance and delete it.  Thanks, Vikram KV    
I was able to install and configure the virtual appliance and plugin but after using the upgrade feature of the virtual appliance, it would barely function and was getting memory errors so I thought I would just start over. Reinstalling the virtual appliance was easy but when I try to register it to a virtual center I get an error saying that there is already one registered to that virtual center. How do I remove it from vcenter so I can register my vceter with the virtual appliance?
uninstall vcenter plugin and start over