Dle diskuzních fór na netu přicházejí v úvahu dvě možnosti:
- přítomnost spywaru (zkontroluj HijackThis-em)
- nekompatibilita s ovladačema NVidia

Jestli nevadí angličtina, můžeš zkusit následující postup:

"Buffer Overrun Detected!

C:\Program Files\QuickTime\QuickTimePlayer.exe

A buffer overrun has been detected which has corrupted the program's internal state. The program cannot safely continue execution and must now be terminated."

Let's first try swapping out your QuickTime.

head into your Add/Remove programs. uninstall QuickTime.

Next, we’ll manually remove any leftover program files and folders.

1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).

2. In My Computer, open Local Disk.

3. Open Program Files.

4. Right-click on the QuickTime folder and click Delete from the shortcut menu.

5. Navigate to C:\Windows\system32\.

6. Remove the files QuickTime.qts and QuicktimeVR.qtx.

7. Restart your computer.

next, we'll get a fresh copy of QuickTime into your PC by doing a repair install of itunes.

switch off antivirus and antispyware applications prior to the repair install.

go into Add/Remove and select itunes. click "Change" and then click "Repair".

if the repair install goes through okay, restart the PC and try launching itunes again.