It is probably a problem with the ctfmon application. Use these steps prescribed by Microsoft:
1. Quit all Office programs.
2. Click Start, point to Settings, and then click Control Panel.
3. In Control Panel, double-click Add/Remove Programs.
4. On the Install/Uninstall tab, click to select Microsoft Office XP product, where Office XP product is the name of the specific Office product being used. If you are using a standalone version of one of the Office programs, click to select the appropriate product in the list. Click Add/Remove.
5. In the Maintenance Mode Options dialog box, select Add or Remove Features, and then click Next. This displays the Choose installation options for all Office applications and tools dialog box.
6. Click the plus sign (+) next to Office Shared Features to expand it.
7. Click the icon next to Alternative User Input, and then select Not Available.
8. Click Update.