Sunday, 1 April 2012

You must use "Turn windows features on or off" in the Control Panel to install or configure Internet Explorer 8.

Quickbooks 2012 Pro with Mar 2012 update on Windows 7 Ultimate with SP1 and all updates to March 2012 including IE9 and .NET 4.0 Full.

Intuit's support article SLN55044 hints at the solution I needed:

I had to use regedit to add the iexplore.exe key with default and path values to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\App Paths\IEXPLORE.EXE.

You can copy the ones from:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\IEXPLORE.EXE

Why Intuit don't just come out with this...

I think it may have been because I installed Opera.