MagCore.dll is a file used by the "ArcSoft" suite of programs, which are mainly video & audio editing tools. Despite this file playing a vital role in the smooth operation of various pieces of ArcSoft software, it's a common problem for it to either be damaged, corrupted or unreadable - leading to numerous errors appearing on your system. To resolve this problem, you should look to fix any of the errors that can show problems on your PC, inclng repairing the file itself and any registry errors which your system may have causing the error.
MagCore.dll errors will often show in this format:
Typical causes of these errors will be down to the likes of the magcore.dll file being damaged, missing or unreadable; as well as your computer not having the correct settings to read it properly. If you are still seeing the errors you have, then it's vital you are able to repair the problems that are likely leading to the messages you're seeing on screen. The way to do this is to first reinstall any ArcSoft programs on your PC, and then use a registry cleaner program to fix any of the errors inside your system itself.
Reinstalling any ArcSoft programs on your computer should be the first thing to try. This can be done by clicking onto "Start > Control Panel > Add / Remove Programs" and then remove the software which is causing the error. After the uninstaller has removed the application, restart your PC and then you should try and install the program again. This will refresh all the files & settings the application uses, preventing the error from loading back up in future.