The only way I resolved any issues that happened importing videos into Adobe Premiere was to install a copy of Quicktime. You don't have to use it but just have it installed.
Important: QuickTime 7 for Windows is no longer supported by Apple. New versions of Windows since 2009 have included support for the key media formats, such as H.264 and AAC, that QuickTime 7 enabled. All current Windows web browsers support video without the need for browser plug-ins. If you no longer need QuickTime 7 on your PC