Following a recent auto-update from the Microsoft Update, I found that my current version of Office 2003 had been updated. No problem I thought until I noticed that a new background programme was failing to close at shutdown and showing the above error with the usual "end now" box.
After Googling this I found a resolve which I've copied in below, as can be seen the update was not meant at all for the version I am running but it did download anyway!
While shutting down a Windows 2000 or Windows XP machine with Office XP, an error popup windows appears warning that CiceroUIWndFrame is not responding. Clicking OK however will cause the shutdown sequence to continue normally.
This seems to be related to Office XP speech/handwriting recognition.
They can be disabled by going to Add/Remove Progams in the Control Panel, Add/Remove Features-Office Shared Features->Alternative User Input and Make unavailable Speech and Handwriting.
I recently experienced the same problem with CiceroUlWndframe. My solution came about when I discovered that I had an unsent email in Outlook 2003 SP3 that got there by way of Windows Live Messenger. I deleted the unsent message and the CiceroUlWndframe error stopped. I'm running XP SP3 and use Outlook 2003 SP3 strictly for the calendar. My regular email service is set up for Outlook Express 6. An attempt to send a message from WL Messenger defaulted to using Outlook '03 and left the message hanging in Outlook '03 since I never set it up for an email connection to the internet. It was the repeated pop-ups that a message was still trying to be sent that got my attention. The suggested solutions previously mentioned by others had not worked for me.