I can’t blog videos from Dailymotion anymore

I can’t insert the code to embed a video in my posts like I used to anymore. If I put the cod in the post, I get an error page from my host. If I put in the html input window, it works but all the rest of my site disappears.
Could someone tell me what in the followin code could cause the rest of my site to disappear?

<div style="margin-bottom:25px;margin-top:25px;"><div style="width:320px;text-align:left;"><style type="text/css"><!-- #i5lri5uvvf2jc9lp8d4o6jie9ebbplijf8r1e1pu7{width:320px;height:256px;border:none;margin:0px;} --></style><iframe src="https://www.dailymotion.com/blog/video/69213?key=5lri5uvvf2jc9lp8d4o6jie9ebbplijf8r1e1pu7" style="width:320px;height:256px;border:none;margin:0px;" width="320" height="256" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" id="i5lri5uvvf2jc9lp8d4o6jie9ebbplijf8r1e1pu7">Dailymotion blogged video</iframe><span style="margin-top:0px;"><a href="https://www.dailymotion.com/video/x1hel_emilie-simon-fleur-de-saison">Emilie Simon - Fleur de Saison</a>Video sent by <a href="https://www.dailymotion.com/Twilight">Twilight</a></span></div></div>

Not only that but I can’t embed the little mp3 player called Dewplayer. What the hell is going on? I could do all these things just yesterday. I’m going nuts.