Malwarebytes is for Malware only. I would suggest Avast for AV and SuperAntiSpyware for your Spyware
Please download Avast from my signature below. Please make sure you do the registration as it is good for a year or more. When it is due simply just reregister it.
Avast in my opinion is better because:
It's FREE to the Home User
It Updates it's Definitions daily
You can scan Individual Files, Folders and Drives
No buying new versions every year
SuperAntiSpyware is also in my signature below.
Both programs are easy on your system and thus will not cause slow downs.
If the other Button for Device Manager is not working then you can delete it. If i am understanding it is a shortcut on your Desktop also?
Before deleting it please let me know if I am understanding you correctly.
I want to be clear on when this all started with your camera. Everything was working fine until you installed IE8 correct?