This may help someone.
I was sent an HTML file with associated css and image files. I created a local directory on my Vista PC with sub directories for styles and images etc.
Opened up the HTML file in IE9, no images displayed!!
Opened up the same file in Chrome and Firefox, no problem images displayed fine.
Moved the files onto my Win7 laptop. Opened up the file in IE9 and the images were displayed!
I then opened a copy of the file in Frontpage on my Vista PC made an insignificant change and then saved it. Suddenly it worked!!
So what was the problem?
Turns out that I had to open the File's Properties==>General tab. At the bottom it said;
Security: This file came from another computer and might be blocked to protect this computer.
I clicked on the Unblock button and it now opens in IE9 with images displayed!!
The strange thing is only the images were blocked, not the css and not the scripts, bizarre!