You can reset Internet Explorer settings to what they were when Internet Explorer was first installed on your PC. This is useful for troubleshooting problems that may be caused by settings that were changed after installation. Be aware that this process isn't reversible, and all previous Internet Explorer settings are lost after reset.
a. Close all open windows and programs.
b. Open Internet Explorer, select Tools > Internet options.
c. Select the Advanced tab.
d. In the Reset Internet Explorer Settings dialog box, select Reset.
e. In the box, Are you sure you want to reset all Internet Explorer settings?, select Reset.
f. When Internet Explorer finishes applying default settings, select Close, and then select OK. Restart your PC to apply changes.