Please give us more information about your situation.
What operating system are you using? Have you manually gone to Windows Update and downloaded the non-critical or "hidden" updates which don't install automatically? Have you ensured you have the latest version of Quicktime?
How fast is your processor, how much RAM do you have and how much free space is on your C drive? When did you last run Disk Cleanup and Defragmenter?
What are you doing to open the program and what are you seeing when you do it?