Are these ten machines on a network? If so, you'll need to contact Adobe Tech Support. There are some special considerations for networked computers.
Also, have you manually gone to Windows Update and ensured each computer has all of the "hidden" updates that do not install automatically as well as the latest version of Quicktime?
Are these computers using the 32-bitor 64-bit versions of Windows 7? How fast is the processor and how much RAM does each have?
What model of camcorder is your video coming from and what format and resolution is it?