Microsoft Word keeps calling Adobe Photoshop!

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Hi, I am writing a college report in which I need to paste several pictures in between paragraph. I am using Adobe Photoshop CS4 and Microsoft Word 2007 and there appears to be some conflict between the two software. When I insert (or paste) a picture into Microsoft Word, it displays correctly, however when I try and resize the picture, Word temporarly freezes and Adobe Photoshop loads up on it's own. Once loaded, Photoshop doesn't appear to be doing anything, it just sits there ready to be used. If I go back into Word, sometimes it doesn't respond and sometimes I can use it fine, however I am in most cases unable to resize my picture still. Sometimes clicking on a picture inside Word without doing anything to it, causes Photoshop to load up. I am not asking how to resize a picture and I do understand I can do this within Photoshop, but I would like to know why Microsoft Word is trying to call Photoshop? and how do I stop this? Thanks for any help