Did you load security software that stops "pop-up" windows? You can start Internet Explorer without add-ons
To identify if an incompatible browser add-on or extension is at the root of your troubles, we recommend taking advantage of Internet Explorer's (No Add-ons) mode. The following are steps to do this:
Click Start -> All Programs -> Accessories -> System Tools, and then click Internet Explorer (No Add-ons).
If your browser appears to be working properly in Internet Explorer (No Add-ons) mode, continue with the following steps to help identify which add-on may be causing the problems.
To isolate the specific browser add-on that is contributing to the issue, you can use IE's Manage Add-ons feature to pick specific add-ons to disable:
Click Tools -> Internet Options.
Click the Programs tab, then Manage add-ons (see figure below):
Note: The Manage Add-ons option under Tools is disabled in No Add-ons mode so you must go to Internet Options, Programs, Manage add-ons to manually enable/disable add-ons.
Select an add-on in the Name list, and then click Disable (see figures below):
Click OK, OK again, OK again and then close IE.
Restart IE normally and see if your problem is resolved.
If it is, you should uninstall the specific add-on via Control Panel's Add/Remove Programs or the applications own uninstaller.
If the problem persists, you will need to repeat steps 1-3 until you have identified the specific add-on causing the problem.
Tip: Disable several add-on's at once to speed up your process of elimination.