I have a website for my photos. I made all the pages as html files, and the site is hosted by Hostmonster. The problem is that when some people go there they get a notice that they may get malware from the site.

I'm not terribly knowledgeable about computers. If there is malware, is it lurking in my files, or is it something on my allotted space on the host's server? What can I do about this?