Sharepoint Ent. 2010 - Error during Installation from VM ISO

During Farm/Custom install on an Ent. 2008R2 VM with SQL 2008R2 installed.

Using SW_DVD5_Office_SharePoint_Server_2010_64Bit_English_MLF_X16-43564.ISO from MAP.

Error:

SharePoint Error 1335. The cabinet file 'STS.CAB' required...

Install must be cancelled as Retry does no good. ISO from Partner site. Hyper-V in Ent. 2008R2 connected to DVD drive.

All is 64 bit.

Could this be related to something in Pre-requisites or just a bad image from MS site?