Having installed a fresh new ESXi 4.1 server, I downloaded the Client Application from the server itself, and ran it.
Part of the way through the install, I get the error message:
The Microsoft Visual J# 2.0 Second Edition installer returned error code '4113'.
To fix this, you need to uninstall any existing copies of "Microsoft Visual J# 2.0 Redistribuatble Package" using Control Panel > Programs > Programs and Features
Once that has finished, install this version from Microsoft.
Now you should be able to install the VMWare client. :)
I hope this helps you out, if so please click on one of the goolge ads to show your appreciation.