Error FastCore routines | Failed update | Windows


After a failed Photoshop CC update, errors about FastCore, MMXCore, and Multiprocessor plug-ins appear when you open Photoshop. In Photoshop, you can't save as PNG or use Save For Web.


Uninstall Photoshop, delete the Photoshop application folder, and then reinstall.

  1. Uninstall Photoshop CC by choosing the uninstaller in the Photoshop application folder. Or, use the Programs and Features Control Panel (Windows 7) or the Programs > Uninstall a Program Control Panel (Windows 8).
  2. Navigate to the Program Files/Adobe or the Program Files (x86)/Adobe folder.
  3. Delete the Adobe Photoshop CC (64 Bit) or Adobe Photoshop CC folder.
  4. Reinstall Photoshop, and update it.

Additional information

Plug-ins and Photoshop

Third-party plug-ins: Before copying third-party plug-ins from one version of Photoshop to a new version, check the plug-in manufacturer's site to make sure the plug-ins are compatible with the new version of Photoshop. Use the manufacturer's installer to install their plug-ins.

Photoshop-shipped plug-ins: Never copy Photoshop-shipped plug-ins from one version of Photoshop to another; they are not compatible. 

For more information about Photoshop's plug-ins, see this TechNote: Downloadable Content (Plug-ins)

Send Adobe your installer log

Contact Adobe Technical Support by posting to, and getting instructions on how to send your installer logs to Adobe.

The log files are located in these folders:

• Windows 32 bit: \Program Files\Common Files\Adobe\Installers
• Windows 64 bit: \Program Files(x86)\Common Files\Adobe\Installers

The log filename includes the product name and install date, followed with ".log.gz." The extension .gz indicates a compressed format. 

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