From page 16 of Performing a Command-Line Installation of vCenter Server

$filepath = "C:\Software\VMware-viclient.exe"
$argumentlist = @'
/q /s /w /L1033 /v" /qr USERNAME=\"Administrator\" COMPANYNAME=\"VMware\" INSTALL_VIUPDATE=1 /L*v \"VMware-viclient.log\" "
'@
Start-Process -Wait -FilePath $filepath -ArgumentList $argumentlist