To what drives are you rendering? What security tools and settings? Most such issues are file I/O hiccups where soem external influence is simply blocking the file or the QT components...
Generally a tertiary drive--meaning never to the boot drive or the AE cache drive. In the case of my most recent persistent hitch with QT the render has failed across two tertiary drives--a healthy 1TB and a healthy 2TB, the 2TB being all but new and wide open. Additionally consider that rendering in any other format to these same drives raises no issues--h.264 included...
As per security--none with Win7 everything disabled.
The unit with the most severe issue is on a new rig for the most part. Not a lot of additional--non Adobe software installed. PolyTrans, MeshLab, Modo rounding out the list. I generally perfer Chrome to browse. QT7...
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Todd recently posted the info about rendering to QuickTime issue on fast machines (can't find that very Forum thread though...) and added the 'QuickTime failure because of its inability to work with large number of processes' section to his 'Troubleshooting QuickTime errors' blogpost you mentioned. Check if the proposed solution is applicable to you.
Did you try Fuzzy's recommendation?