Hi Miguel -
Nice photo. While it is in portrait orientation and computer monitors usually are in landscape orientation, there is no fundamental problem getting it to the correct dimensions. The only problem is that to get a landscape oriented image out of this, one has to crop the original very heavily. Unfortunately, scaling it differently on the two axes is not really an option -- only cropping. The attached photo show what it might look like. Note: the thumbnail version is full of artifacts and looks harsh -- instead, double click on it, save it, and view it with real image viewing software.
That being said, I don't think you are going to like it as a desktop or other background because it has such high contrast and detail the icons on your desktop are likely going to become very difficult to see if they are put over this photo.
Instead, I would recommend a much lower contrast version, possibly in B&W, and possibly done with a soft, simplified, painting-like feel. It's too late in the day for me to illustrate this now, but I'll try to have a shot at it tomorrow.
Best regards,
Tom M