Blank User Accounts Applet: :

Problem:
When you double-click User Accounts applet in the Control Panel, the User Accounts applet opens, but it may be completely blank.

The buttons Back | Forward | Home are displayed in the dialog.

Resolution:
To resolve the problem, type these commands from Start, Run dialog:

regsvr32 jscript.dll

If that does not help, execute the following commands as well.

regsvr32 nusrmgr.cpl
regsvr32 /i mshtml.dll