Windows 7: Problem with VirtualBox Drivers

I reverted to a system image due to some problems I was having with my computer. When the system image was loaded, I found that some VirtualBox drivers were not working properly. I tried uninstalling the software and re-installing, but the drivers are still showing up with the yellow triangle exclamation mark. See the image. Anyone know how to resolve this?

Update: My old antivirus software was preventing it from uninstalling. I had uninstalled my antivirus software yesterday, but remnants of it still remained on the system and prevented me from uninstalling VirtualBox. I will now have to start a thread to get the remnants of that cleaned up.