LightRoom creates an exportable slideshow. I wanted to show you a html example, but I don't have any online at the moment. LR also creates Adobe PDF ones like this
. Adobe LR is available for free for a 30 day trial period.
Another option is to use a free account at PhotoShelter (full screen slideshows are available). I think SmugMug may have a similar option, or else Photo.Net.
As for colour, perhaps the monitor / computer has not been calibrated. Check out the Spyder system. Not being sharp, might have to do with the file sizes you were using... possibly. As for the Windows slideshow function, I never use it, so I don't really know.