Can no longer start Civ4

[Merovech]

Edit: Fixed by system restore, original problem still unknown.


Hey,

So, earlier today, my Civ4 BTS, all patched up, etc. was taking a really long time to close, so I closed it using the Ctrl-Atl-Del Task Manager. I then tried to re-open it about half an hour later to check on something, only to get the following error:

"Cannot locate the CD-ROM
Please instert the correct CD-ROM, select OK and restart application
Click here for more information about this error"

Clicking sends me to this unhelpful and frankly rather disturbing website: http://www.2kgames.com/#/?product=136093115&locale=1033&error=6

I don't have the CD with me; it's a state away. Has anyone encountered a similar problem or know what I can do?

Thanks,
Merovech