SCUP Custom Update Installable Rules

Struggling with the Install Rules logic on an EXE I have published to SCCM, created in SCUP.

The EXE is a Microsoft Update that is not available as a WSUS update (KB2647753).

My package needs to be targeted at all 32 Bit Win7 machines which don't already have the update.

My query looks like this:

>AND
        >AND
                >OR
                         Windows Version = Windows 7.
                         Windows Version = Windows 7 SP1.
                   Processor Architecture is x86.
                   NOT: WMI Query 'WMI Query 'select * from WIN32_QuickFixEngineering where HotfixID="KB2647753"

According to SCCM, this update is not required by any machines at all, which is suspect.

I found it difficult to understand the way the logic is layed out in SCUP, the nesting is very confusing for someone who doesn't work with Boolean / Logic expression very often. I got the layout for the expression from the end of this article:

http://blogs.technet.com/b/dominikheinz/archive/2011/10/17/deploying-custom-msu-updates-with-sccm-and-scup.aspx

I also have one other query. The use of the WIN32_QuickFixEngineering class? I've read elsewhere that SCCM 2007 no longer collects information on this class as the overhead is too large, so is it valid to use it for an Installable rule??