Just Thoughts and Nothing Else

I'll tell you a little story about our friendly little birds we call Robins.

About 2 1/2 years ago, this Robin suddenly appears at my window that faces the south and has a railing near the window where as a bird can sit if he likes, if he behaves and doesn't leave me his droppings all over the deck, the glider, the railing and much to my amazement, all over my windows too. 
Shortly after my husband passed away the following spring this bird appeared and of course my children have a tendency to think it's my husband coming back re-incarnated in this bird!  I understand their need to hang on, but a bird?
Well, now that I've been dealing with this bird for 2 1/2 seasons, I'm starting to wonder myself only for the sheer fact that this bird is relentless and is wearing on my patience.  My husband was a very determined man and his favorite place to sit any time of the day was in that particular area of our deck.  He loved his glider very much.  But the odd thing is this, when the bees or flies would bother him on his glider he would swat them with his fly swatter and then line their bodies on that particular railing located next to the window in question.  He said he was doing that so they (the bees and flies) would go tell their friends to stay away from that crazy man on the glider once they seen their buddies bodies laying all over the railing.  Yes, this might sound a little crazy but if you knew my husband, you would know immediately that he loved to make people laugh and he loved to make people wonder how sane he really was?
So back to the bird.  One day this bird was sitting on the railing and I started to hear a loud sort of thumping.  at first, I didn't know where it was coming from because I guess as I passed the area where you could see the windows I am talking about, the bird would fly away.  It happened several times throughout the day but always started about 5:00 am every morning like clockwork. A few days of this had gone by and one day I noticed there was this white stuff all over one of the windows.  I got closer to the source and noticed it was bird droppings and I kept thinking that it was impossible that this just couldn't be that because birds don't fly sideways.  The thumping continued and now I was sneaking up on this bird in case it was the reason for the bird droppings and I wasn't quite convinced yet that a bird could do this because it was not actual bird droppings but smeared white stuff.  Well, it was the stupid bird and he was slamming his body against my windows and jumping back on the railing.  He would slam his body for 20 minutes if you let him and come back later in the day and do it all over again.  I'm telling you he is crazy!
I got all kinds of advice from the internet, friends etc, but the thumping and droppings continued and the first season of this bird almost drove me insane!  Next spring came and back again.  This time the bird was getting braver and if I blocked one window with newspaper and then colored paper, he would go to the next one.  But each time he would get nastier.  He would hop along the railing as if he were daring me to try and catch him.  I couldn't wait until the summer was over with this bird and the only reason I didn't kill him, is because I just couldn't!  I had people offer to kill him for me, but I couldn't bear the burden of the guilt of killing something so much smaller than myself and I am the one supposedly with the intelligence here and why can't I figure out something to re mediate this problem.  Why couldn't I find the answer?
Another summer gone and now I'm on my third season with this bird who seems to be trying to get into the house or just get even with me for something!  Yes, I'm going a little nuts right now because I don't feel that I should have to cover my windows completely with paper as not to be able to see out of them, let alone deal with not having sun shine through my cleaned windows.  So I tried hanging things from the window like a balloon sock, a wind spinner, snakes on the railings (rubber ones) and decals on the inside of the windows.
To no avail, this bird just tries to go between them and still if they are moving too much, he goes to the next window, and by the way there is stuff all over them too, but whichever one is moving less he goes to.  Now I've resorted to hanging balloons off the back windows but they deflate too quickly and I'm left with having to put up with this again.
This morning was the the last morning I could stand it anymore and I had to go out and clean everything off of everywhere because he had a field day this weekend because I was gone quite a lot and wasn't here to monitor his actions and throw a slipper at the windows to scare him away.  He ate something bad I think cause it was a mess.  This bird is so determined, that I've given up and taped all kinds of paper all over my windows again!  He is so determined that when I put the paper on the windows and I do it to all of them, that this season he just goes to my skylights and starts slamming his body on them.  I can't throw the slipper up there because I can't look up to do so and the noise and the fact that I can't find the answer to this problem is driving me NUTS. 
So there's my dilemma, and if anyone has a real solution that really works and that I don't have to cover my sunshine from coming in, please feel free to comment.  I will not kill him, because What if?