This file is used by Quicktime. It is used by Quicktime in order to check for updates at the Quicktime.com site. In order to remove it from the system tray, perform the following steps:
1. Open Quicktime.
2. Select Edit > Preferences > QuickTime
3. The QuickTime settings box will open.
Select "Update Check" from the dropdown
4. On the bottom of the screen, you will
notice a checkbox for "Check for
updates Automatically", uncheck it and
close out Quicktime.
The QTTask.exe file will no longer start up.
Did you run a file on a removable disk using QuickTime?