First, download and install the vCLI tools from vmware.com on your desktop.
Second, download the CIM Providers from HP.com
Third, Place host in Maintenance Mode and then scan the ESXi host for the Bulletin ID to be installed
c:Program Files (x86)VMwareVMware vSphere CLIbin>vihostupdate.pl -server
should return a name like
hpq-esxi4.1uX-bundle-1.0 (note: this is case sensitive)
Fourth, install the bulletin
c:program files (x86)VMwareVMware vSphere CLIbin>vihostupdate.pl -server
Fifth, reboot the host.