so if I'm reading your post correctly, since you installed a 'custom control' you are now unable to access the ActiveX section under Internet options?
We really need further information as to what the custom control is or you could try removing it and seeing if the access comes back.
Here are the details:
ActiveX Control is installed to windows\system32
I have a ASP.NET web application in which accessing this control using <object> tag by providing class id & code base. I have set all the necessary settings for ActiveX controls under Internet Options.
When i installed IE10 in Windows 7 machine, i can able to access the ActiveX control, but the same not able to access in windows 8 machine.