I've the same problem with quicktime running on a Windows xp home edition, the same message about the file .qts.
I checked in the system 32, there is a folder named Quicktime, containing also the file .qts.
What do you think should I do? Cancel the whole folder? or only the file? Am I going to create some kind of mess with other applications?
I think these are stupid questions but... forgive me, I'm not an expert...
Thank you for your help!