Quicktime 7.1.5 not functioning on window

Question

i've updated quicktime to the latest version which is 7.1.5. later than that i try to watch movie trailer in apple's website a symbol appear on the screen which look like a Q symbol with a question mark. i try to reinstall it again but it come out with the same problem. i've updated my norton anti-virus and spyware doctor and do full scan on it and found nothing file is infected. i also update the apple software try to see whether is there any software for it. but after everything i've try to do, the result is the same; a Q symbol with a question mark. help me please....

Answer 1

I had the exact same problem and came across some instructions that helped me, so you might give these a try yourself:
1) open QuickTime Preferences
2) click the Browser tab
3) click the MIME Settings
4) select Miscellaneous - Miscellaneous file formats
5) uncheck Flash media (if it's already unchecked, then click the Use Defaults button at the bottom)
If that still doesn't fix the problem, continue with this:
1) within QuickTime Preferences, click the File Types tab
2) select Misceelaneous - Miscellaneous file formats
3) uncheck Flash media (or Use Defaults button if necessary)
For some reason, these two lists aren't linked to each other. So when you change one, it won't change the other automatically. There might be a feature to link the two, but I'm not aware of it at this time.
Also, be sure you have the latest Macromedia Flash Player (http://www.adobe.com/shockwave/download/download.cgi?P1ProdVersion=ShockwaveFlash)
Hope this helps!
Dell Optiplex GX520   Windows XP Pro