Can not connect to network

I have been having problems connecting my laptop to my network. It started after there was an automatic Windows update. I was able to do a system restore and then connect with an ethernet cable or wirelessly. This happened a couple of more times. I am now not able to use any earlier restore point and and connect to my network. It appears to be the problem with only my home laptop (Dell Studio 1558). I can still connect (via ethernet) to my desktop and work laptop (also via wirelessly) and to my smartphone. I tried restoring the network drivers from the original CD is received with the laptop. Is there something in a setting that can be changed to fix this problem? Or would I have to do a complete reinstall of Windows to fix the problem? Any other suggestions would be greatly appreciated.

Thanks,

Rob