Placing Image - Different on another computer

I am using the following code to place and image and it works just fine. However, when I tried it on another computer (with a different screen resolution), the size and position is way off with respect to the Excel sheet. Is this due to screen resolution? I am not sure what the root cause is and how to address it so that it works on any computer.

Code:

---

    With ActiveWindow.Selection.ShapeRange
        .ScaleWidth 0.5, msoFalse, msoScaleFromTopLeft
        .ScaleHeight 0.5, msoFalse, msoScaleFromBottomRight
        .Left = 460
        .Top = 285
        .PictureFormat.CropLeft = 121.5
        .PictureFormat.CropBottom = 33
    End With

---

P.S. The two computers were also 2003 and 2010 so that is another difference. But I am guessing it has more to do with screen resolution?

It looks like 2003 and 2010 handled the above code in a different way. But this adjustment worked for both.

Code:

---

    .ScaleWidth 0.5, True
    .ScaleHeight 0.5, True

---