Make sure your system meets the hardware requirements for the vSphere Client.
vSphere Client Minimum Hardware Requirements and Recommendations
|vSphere Client Hardware||Requirements and Recommendations|
|Processor||500MHz or faster Intel or AMD processor (1GHz recommended)|
|Memory||500MB (1GB recommended)|
|Disk Storage||1.5GB free disk space for a complete installation, which includes the following components:
If you do not have any of these components already installed, you must have 400MB free on the drive that has the %temp% directory.
If you have all of the components already installed, 300MB of free space is required on the drive that has the %temp% directory, and 450MB is required for vSphere Client.
|Networking||Gigabit connection recommended|