Background
Fresh install of VSphere 5.1.0 U1 on a Windows 2008 R2 Enterprise x64
MS SQL 2012 Enterprise SP1 x64
Member of a 2K3 domain
UAC disabled for the user account installing VSphere
MD5SUM matches
SSO installed ok
inventory installed ok
VSphere is failing with an error 1335 vpx.cab is corrupt
vpx.cab is extractable via 7zip
Any ideas?