Hi,
Any advice on why I might not be able to remove these files would be greatly appreciated.
You probably just have to use some app that works with root rights to do the job. There is a multidute of options but you can use Titanium Back, or Super manager, or SD Maid, or some other tool that can remove system applications. Titanium might be more useful since you can back up what you remove and restore later if you need. Be careful though, any of these apps can potentially brick you system.
You can use a more direct approach and delete manually the files from /system/app folder using either, for example, Total commander, or file manager in Super Manager or noogie SD card. You have to know what you are doing, though.
Since you even ask the question, probably it is best to make a full back-up, if have not done so yet (yes, using noogie) and then try Titanium Backup (freeze or remove). The free version should be more than enough for the task.
PS When using a file manager to delete/modify files in '/system', remount the partition to read/write mode.
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