Making a vision board using MS Word super frustrating?

So I'm making a vision board and I won't get philosophical on whether they work or not, I just want to get this one done. I've got all the images I want saved on my PC and I've tried to get MS Word to make a collage of them without displacing all the images every time I move one around or re-size them, but it's not going well to, put it nicely. I'm not going the paper route where I print all the images off then physically cut and paste them, so my question is does anybody know what is the best program to use to simply and effectively create a "digital image collage" that is functional and professional? If you did use MS Word, what did you do to keep images in their place?