It sounds to me like a cache problem. Try erasing all the cache files and even cookies. If you don't know what cache and cookies are, and you use Internet Explorer, then do the following:
1. Click Tools, Internet Options. 2. Click Delete Files button to delete files. 3. Click Delete Cookies to delete cookies.
There is also an option in Internet Explorer where you could set how often to "reload" the cached sites. It's on the tip of my tongue, I mean fingers, but I can't pinpoint it right now. Try support.microsoft.com (then Search the Knowledge Base) and search for words "load cache" for the product Internet Explorer. That's only a start, by the way.. <g>