You might be here because you’re having titlebar problem with your Internet Explorer. When you run Windows Explorer or start Internet Explorer, the text in the title bar may be displayed as a single letter (for example, an “M” or an “E”). It might be your Internet Explorer’s titlebar contain garbage characters, or title bar truncated to 1 character. See an example below.

This Internet Explorer title bar problem can’t be fix by editing the registry. After a little searching, I found a solution to fix this problem.
It seems that Google Toolbar has been reported to sometimes produce truncation of the title bar text. Uninstalling and reinstalling Google Toolbar will fix the problem.
To uninstall the Google Toolbar from your system, use the Add/Remove Programs utility in the Microsoft Windows Control Panel.
1. Click Start
2. Select Settings
3. Select Control Panel
4. Double click the Add/Remove Programs control panel icon
5. Select Google Toolbar for Internet Explorer, and then click the Remove button.

Once you’ve done uninstalling Google Toolbar, go to this link to download and install the latest version of Google Toolbar.
If uninstalling and reinstalling Google Toolbar didn’t work for you, try the solution suggested in Microsoft Support.