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Symptoms Unable to install vCenter Server 4.x Installing vCenter Server 4.x fails You see the error: The following port numbers are either invalid or already in use. VMware VirtualCenter HTTP port: 80 install-vcenter-fails-error port-in-use check-ports vcenter-port-in-use Resolution Method 1:   Turn Off the feature from "Programs and features" IIS or World Wide Services  Or Try Stopping the these services and then re-try. Method 2:   This issue may occur if Port 80 that is required for vCenter Server installation is in use by another application or service.   To resolve this issue, identify the application that uses Port 80 and choose a different port for the application or kill the application.   To resolve this issue:   Click  Start  >  Run , type cmd, and click  OK . Run this command: netstat -nab > netstat.txt The output of the  netstat  command is written to the  netstat.txt ...

Here's hopefully a definitive solution to this, Install Active Directory Lightweight Directory Services (AD LDS) for  Windows 7 link :   Microsoft

Symptoms You see the following error when installing vCenter Server 4.0: Setup cannot create vCenter Server directory Services Instance Refer to C:\TEMP\....\jointool-0.log for more details. Click Yes to force this operation. If you click  Yes  Error comes  Setup cannot create vCenter Server Directory Services instance. Error 28038 or  No , the vCenter Server installation rolls back. The jointool-0.log contains entries similar to: [Date Time ServerName] Operation "Create standalone instance VMwareVCMSDS" failed: : Action: Create Standalone Instance Action: Creation of standalone instance Action: Create Instance Problem: Creation of instance VMwareVCMSDS failed: The folder C:\Program Files\VMware\Infrastructure\VirtualCenter Server\VMwareVCMSDS is compressed. Active Directory cannot be installed in a compressed folder. Select a folder that is not compressed. [Date Time ServerName] Recovering from failed Operation "Create standalone instance VMwareVC...

Virtualization Technology in BIOS This post explains how to enable Virtualization Technology (VT) in motherboard BIOS. To run some operating systems, virtualization software and virtual machines hardware virtualization should be enabled. Mostly, operating systems which not required virtualization technology run normally when virtualization technology is enabled, but for the operating systems required this technology, it must be enabled. All latest processors and motherboards support virtualization technology, check your motherboard vendor about this support and how to enable or disable VT in BIOS.  Operating system detects the hardware virtualization technology once it’s enabled on your motherboard. Where to Find Virtualization Technology (VT) in BIOS? This setting is found under ‘Advanced Chipset settings’ in AWARD BIOS. It will be different for each motherboard. Check your mother board manual. ...