Removing OLE_LINKs in Word document

[Guest]

In several of my Word documents, when I choose "Insert /
Bookmark," I notice there are things called "OLE_LINK"s.
I'm not trying to link to the document to any other
document, it contains not pasted links, etc.

Is it safe for me to delete these OLE_LINKs without
corrupting the file or causing other problems? How do I
avoid them showing up in the first place?

Thanks.