Newbietoobie, i gotta say thats quite a strange explanation. I've done quite some shots through windows, macro as well as tele, and never noticed any kind of disturbance. (Except maybe dirt on the windows 
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Well, it depends on the window, you might have lucked out and gotten a particularly nice flat batch of glass in your house. It depends on a lot of things. In fact I just logged back in to give some follow-up explanations on why this happens, and why you can't easily see it with your eyes but your camera will record it. Macro is not going to show this much because it is often done at wider angle lens settings, meaning it doesn't amplify the effects as much. You have to consider too the distance of the subject and camera from the window. If the camera is close to the window, the subject further, then the window-glass will have to be flatter. This is why camera filters cost so much. They have to be made optically flat. Can you imagine trying to pay that price per area for a typical house window? The price of an optical-flat the size of a typical window would bankrupt most any of us. If you are shooting from across the street at some store-window display, then of course the things behind that window will look perfectly sharp. The defects in that window too far away to impact the image.
It is also worse the larger the aperture used. Think about the diameter of the pupils in your eyes. In daylight that's about 2mm. Your eye is only getting the light coming from any 2mm dia. area of glass at one time. Individually, each 2mm dia. area of that glass may be acceptably flat, optically. This is also why optically-flat optics of smaller diameters are so inexpensive, it's so much easier to polish small areas optically flat. Now think about the dia. of the entrance-pupil of your camera. That 35mm diameter glass has to take into account a 35mm diameter's worth of light-rays coming through that window. Any non-flat defects across that 35mm area will be added up. Whereas your eye might only be seeing through one clear 2mm spot at any one time. Your eyes can't detect any problems, but your camera sure will.
You can prevent some of this problem by stopping down the lens. But shaded wooded scenes like this, at longer zoom settings, won't like that. Then it might require slower shutter speeds, any motion-blur from that will only compound the already present defects in the house-window glass. Using wide-angle will effectively disappear all window defects, because then you don't see the amplified optical defects, they become smaller, just as your subject becomes smaller.
Having said all that:
B0whunt3r, after seeing that you had IS off, and those shutter speeds used, then it's definitely both problems. Camera shake, and shooting through house windows. I have no problems holding a camera steady at 1/15s but you might. Next time you are shooting through a window, put the front of the camera's lens barrel against the glass, that will help to stabilize your camera immensely. But do it slowly, so you don't scare the animals with a "clunk". I'll often put it up against the edge of a finger, the finger between camera and window-glass, so as not to make any noise or hurt either window or camera. And use the smallest aperture possible (light and shutter-speed permitting) so as not to compound window-glass destroying the image further. Above all, try to not shoot at sharp angles through that close-up window glass. This will soften an image faster than anything.
For any of you that doubt this: Go ahead, try it. Put your camera up against a window and shoot at distant subjects using long-focal lengths at various degrees of angles through that glass. For the best effect, use wide apertures at steep angles through that window-glass. Don't say you weren't warned. :-) For even more fun, move your camera around to various areas of that window-glass and shoot the very same subject with the same camera settings. Watch as the quality changes depending on what section of that house-window that you shoot through. :-) I've already tested all these things after getting images like B0whunt3r has, it's why I know what to suggest for you to try to convince yourself too.
