VMware KB1016262 – vCenter Agent Install Fails on ESXi 4 Host
VMware just posted an alert on this for ESXi 4 Hosts managed by either vCenter 4 or 4 Update 1. If you remove and re-add the Host to vCenter, or upgrade vCenter to Update 1 you may experience this issue.
At this time, there is no official fix, however it appears a reboot should fix the [...]
