Try reinstalling quicktime. Go on control panel uninstall quicktime. Then go to this url:http://www.apple.com/quicktime/download/win.html
Download it again. And install it again. Itunes should now work.
If it doesn't, for Video problems: Open QuickTime Player and go to 'Edit' -> 'Preferences' -> 'QuickTime Preferences' -> 'File Types' -- check here to see if the file format of your problem video files is selected.
For Audio problems: Open QuickTime Player and go to 'Edit' -> 'Preferences' -> 'QuickTime Preferences' -> 'Audio' -- Here you will see a Device is needed that will play your sound. Select 'Audio Playback and Recording Devices', If you are having an Audio problem it may be due to having no device or an improper device.
Good Luck
FIRST try the simple solutions. Check if your speaker wires are plugged into the proper ports.
If you are unsure, it won't hurt to try different configurations.
(If you hear sound from other devises such as plating a CD of the "Microsoft Sound" when starting up or shutting down, then the speakers are wired correctly.)
If this is OK then try...
Go to your "Device Manager" (Right click on 'My Computer', select 'Properties', click the 'Hardware' tab, click the 'Device Manager' button. Click the "Sound video and game controllers"). If there is some kind of a "Warning" icon superimposed on the 'speaker' icon there is your problem!
If no "Warning" icons then try...
One at a time...
Double click on each of the devises that have 'Audio' in the listings.
Click the "Properties" tab, look for any "Warning" icons
Uninstall the DRIVERS for THAT DEVICE only. See instructions below.
Click on the faulty devise and hit the remove button, follow the instructions given by the program.
Shutdown, restart, the device will automatically reinstall by the "Found New Hardware" program.
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