Occurrence with Internet Explorer. Since Prometric disabled security for TOEFL iBT applet, this annoying information bar just kept showing up.
Solution:
- Open regedit (Start > Run > regedit )
- Navigate to HKLM\Software\Policies\Microsoft\Internet Explorer\Security
- If those key don't exist, you'll probably have to create them. They are case-sensitive !!!
- Now, create the following DWORD (CASE SENSITIVE !!!): DisableSecuritySettingsCheck
- Give this DWORD the value: 1
source: 
http://www.astahost.com/info.php/Disable-Annoying-Information-Bar_t19272.html
For 64-bit system, type gpedit.msc. Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Look for Turn off the Security Settings Check feature and set it to Enabled.