You are certainly brave, Tom. Nice work !
I take it what you obtained from HP applies to all systems with this device - Intel PCHM SATA AHCI Controller 6 Port
I don't understand why Sony does not offer a more recent IRRT driver than what's showing on their site for your Vaio model since it definitely is causing Windows Update issues.
Did you need to install the Hotfix after updating the Intel Rapid Storage Technology driver or did installing the updated driver resolve the Windows Update issue ?
MowGreen
Windows Expert IT Pro - Consumer Security
*-343-* FDNY
NEVER FORGOTTEN