Sometimes an add-on is the cause of a browser error, usually one in the 400-range, like a 404, 403, or 400. Since it’s often difficult to tell which add-on is causing a problem, you need to disable each add-on, one by one, until the problem goes away. This is a very useful troubleshooting step when solving a wide variety of browser issues. Time Required: Disabling IE add-ons as a troubleshooting step is easy and usually takes less than 5 minutes per add-on
Disable Internet Explorer 11, 10, 9, and 8 Add-ons
You can now test whatever activities in Internet Explorer were causing the problem you’re troubleshooting here. If the problem isn’t resolved, repeat these steps, disabling one more add-on at a time until your problem is resolved. This option will show you all the add-ons that are installed to Internet Explorer. You could instead choose Currently loaded add-ons but if the problem add-on isn’t currently loaded, you won’t see it in that list. If you’re troubleshooting a problem where you don’t know which add-on is the culprit, just start at the top of the list by disabling the first one you can. If you see the Enable button instead of Disable, it means the add-on is already disabled.
Disable Internet Explorer 7 Add-ons
If you’ve disabled all Internet Explorer add-ons and your problem continues, you may need to Delete Internet Explorer ActiveX Controls as an additional troubleshooting step. The resulting list will show every add-on that Internet Explorer 7 has ever used. If an add-on is causing the problem you’re troubleshooting, it will be one of the add-ons listed here.
