Make sure that the vSphere Client hardware meets the requirements.

CPU – 1 CPU

Processor – 266MHz or faster Intel or AMD processor (500MHz recommended).

Memory – 200MB RAM

Disk Storage – 1GB free disk space for a complete installation, which includes the following components:

Microsoft .NET 2.0

Microsoft .NET 3.0 SP1

Microsoft Visual J#

vSphere Client 4.0

vSphere Host Update Utility 4.0

You must also have 400MB free on the drive that has your %temp% directory.

If all of the prerequisites are already installed, 300MB of free space is required on the drive that has your %temp% directory, and 450MB is required for the vSphere Client 4.0.

Networking – Gigabit connection recommended.