Help needed, website has glitch now unable to access

[GreatWonder]

Accessing a major UK website on a daily basis, selecting various options which open in new windows. 2 windows open together, one starts registering a very rapid keypress on it. I close the window in front which re-opens itself automatically and keypress detection starts again.
Close window and quit quickly to site's main menu. Under all the main pages headings text now replaced with "Language Pack Uninstalled" or something SIMILAR - this is from memory!!
Access another part of website, all link titles now saying the same. Exit the website. Now I am unable to access the site at all (just receiving the ususal browser message "This page cannot be displayed") like the site is down, except can access from any other computer.
All other websites I can access fine, just this one that had a funny turn. It's a monthly subs site so not happy as I don't have a clue what has happened. All other sites are working fine. I'm using Windows XP professional and would appreciate any advise as to what has been knocked sideways on my computer? (Virus check is clear).

[MD]

have you tried going to the page and pressing CTRL + F5 to do a clear reload?