Phew! Panic over!
In frustration I decided to shut the PC down. When I did so, it said there were 3 updates to be installed (I'd seen it had been getting updates, but I hadn't had a message saying I needed to shutdown and restart for the updates to take effect).
When I restarted the PC, everything seemed to work OK (IE7, Outlook and Frontpage). Hoorah!
So I'm pretty sure I was right, some updates had somehow corrupted my MS applications and these later updates sorted the problem out.
Thanks again for all your suggestions and help!
Now I can go back to enjoying WAB - are there any photos from Minsmere yet?
