I’ve struggled for months with this error message from Quicktime Player on our main Windows 7 editing system. Quicktime simply would not open no matter what “fixes” were applied from the internet (and there were plenty “suggested” ones out there).
It took me probably 4 or 5 hours across several different days (and attempts) during “down-time” to FINALLY find a “fix” that worked. It appears the REAL problem is that virtually none of the well-meaning folks who posted fixes can write accurate instructions. I finally found the right mix of instructions from someone who had gone through the same frustrations as I did.
What basically happens with this problem is that Quicktime’s installer somehow messes up permissions on Windows 7, so when you go to run the program, Windows 7 doesn’t allow it to start. The problem occurs in the registry across dozens of entries, so fixing it manually is a nightmare, and simply uninstalling the program doesn’t delete the registry entries, so they remain borked, even when you reinstall Quicktime.
What every online set of instructions leaves out is that you MUST run particular file in Vista compatibility mode before the fix will work. So use the instructions listed at this link:
But add the following:
AFTER you install subinacl.msi, go to C:\Program Files (x86)\Windows Resource Kits\Tools and right-click on subinacl.exe and change its compatibility mode to Windows Vista (Service Pack 2). Do the same thing to the reset.cmd file that you downloaded.
Every set of instructions on the web leaves out the part about changing the compatibility of the subinacl.exe file, which from all the research I did, isn’t a normal Windows 7 component. So by NOT changing the compatibility of the file, it doesn’t run right. This is the ONLY way the fix in the link will work properly on Windows 7.
Hope this helps someone and saves them from the hours and hours of frustration I went through. While I sincerely appreciate the efforts of others to help people solve computer problems, it drives me crazy how techies are unable to clearly write down the steps necessary to apply a fix. Unfortunately, this inability to write clearly is very common on tech based sites.