To set up a router, you may install the setup utilities, but I never have.  You can just use the Web access by connecting your ethernet cable directly to the unit.  I was going to check, but the graphics are so bad in the user manual, I can't see what they are doing.
 
Do you see how to do the web setup and is that what you are needing to do?
 
It is always good to update the firmware of the router, but that is not a driver.
 
Disable what feature exactly...is network magic still active after you uninstalled it?
 
Can you restore to a period prior to loading the Linksys software?