When you use Control Panel to open the User Accounts applet on a Windows XP computer, you receive an error that is similar to:
Microsoft HTML Application host has encountered a problem and needs to close.
This behavior will occur if the the mshtml.dll file is not correctly registered.
To resolve this behavior:
1. Open a CMD.EXE window.
2. Type the following command and press Enter:
regsvr32 /s mshtml.dll