Qttask.exe is an application file associated with Apple's QuickTime software. This is a harmless application, but it is not necessary to have it running if QuickTime is not in use.
QuickTime is Apple's media player application. Individuals who use QuickTime frequently for viewing videos or listening to music may want to set Qttask.exe to open at start up, but it is easily disabled through MSConfig on Windows machines or System Preferences on Mac computers.
QuickTime works with Windows and Mac OSX. Apple boasts that it is compatible with an impressive range of file formats and features a clean, easy-to-use interface.