I am sure you like to know what is the cause of virus at my blogs. I find out that it is the codes which I added in blog long time ago. Anyway I have removed it and all my blogs are back working. Some bloggers are also having the virus at their blogs but they might not know about this. I think if you visited the blog you will see it goes blank for a while so you cannot comment or read at blog.
Most of the bloggers are having this code too, it is the paying post! Are you having this code at your blog?