AC4BFSP.exe has stopped working problem

I am not sure of IDM. But, you need the drivers and install them.

First off why aren't you listing your system specs so we know what type of video card or machine we are dealing with

I know the other poster is helping you but not knowing your specs he is throwing blind help at you

Help us out and fill out your machine in full detail if you don't know download this and use it to get your specs Speccy - System Information - Free Download


Now after we get this established we can further diagnose your situation it's pointless to help you if we don't what's causing the problem from what it sounds you need to do some updating and maybe some Direct X update but when you get us the information we will cross that road


Also if you are having browser issues something is telling me there is more going on then just the Video Card

You can uninstall IDM and then try to download the drivers.

Have you tried to Diagnose with fix it ? fix it for me - Search Microsoft.com

Best thing for you to do is delete the eithernet adapter

refresh it for a reinstall if that doesn't work do a system restore and see if that fixes it then try to download the new video card driver at this point this would be your best shot without doing a clean install