Error message the procedure entry point CMBlockBufferCopyDataBytes

Entry point errors can usually be fixed by deleting the offending dll, then repairing the component it is part of from the programs and features control panel. CoreMedia.dll is part of Apple Application Support and can normally be found in

C:\Program Files\Common Files\Apple\Apple Application Support or

C:\Program Files (x86)\Common Files\Apple\Apple Application Support.

For general advice see Troubleshooting issues with iTunes for Windows updates.

The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down the page in case one of them applies.

The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try theiTunes for Windows (64-bit - for older video cards) release as a workaround for installation or performance issues, or compatibility with QuickTime or third party software.

Your library should be unaffected by these steps but there are also links to backup and recovery advice should it be needed.

tt2

I'm not technically minded whatsoever so how do I begin to get my i-tunes working again!! All I done was was try and install the update before I realised I had a problem - a big one obviousl!!!

The troubleshooting tip should be able to guide you through the repair steps. What error messages do you get?

tt2

I Got the message ' The procedures entry point CMBlocBufferCopyDataBytes could not not be located in the dynamic link library CoreMedia.dll ID probably have more idea of if it was written in Japanese lol!!

So this should cover it:

Entry point errors can usually be fixed by deleting the offending dll, then repairing the component it is part of from the programs and features control panel. CoreMedia.dll is part of Apple Application Support and can normally be found in

C:\Program Files\Common Files\Apple\Apple Application Support and/or

C:\Program Files (x86)\Common Files\Apple\Apple Application Support.

Using Windows Explorer browse to each of the locations mentioned above. If one of them doesn't exist don't worry about it. When you open one of the folders look for a file called CoreMedia.dll, click on it to select, then press Delete on your keyboard to delete it. Confirm that you want it deleted. Again, don't worry if it isn't found,just try the other folder.

Now open the Windows Control Panel, then the Programs and Features control panel inside that. Locate the entry/entries for Apple Application Support. You may have both a 32-bit and 64-bit version. For each that you have select it and click the Repair button.

Try running iTunes now.

tt2

Thanks for your help - it's reallly kind of you....

I'll try tomorrow and let you know how I get on! For a non techy it's like flying to the moon! I'm okay with tax though lol

Rgds

Derek

You're welcome. 🙂

Feel free to ask if you need anything expaining in further depth.

tt2

Hi,

I Managed to find, delete and repair the first link you listed but to no avail sadly.

i Then thought ID try the second link and found a coreMedia.dll file in there. I tried to delete but it saying the action can't be completed because the file is open in iCloud Photos.

Any thoughts?!

Thanks in advance

Derek

See Note 3 below the second box of the user tip.

tt2

Can't see where you mean!! Sorry 😟

Note 3

The utility Unlocker may be able to reveal which processes are preventing you from deleting folders (or files) and either close the locking handle or force delete the folder. Autoruns is another useful tool for identifying and selectively disabling start-up processes. You may also find that you can delete the files or folders in question if you reboot the computer into Safe Mode.

tt2