Try System Restore again, go back at least 2 days.
If no success then try starting in Safe Mode - tap F8 as pc starts.
Go to control panel - programs and uninstall anything installed in the last 2 days
Tick the box to "Show updates" and look for Internet Explorer. Tick to remove this. It will not uninstall IE but roll it back one version and remove the Conduit Search browser hijacker that has upset your computer
Reboot and if successful download and run Malwarebytes.
Then carefully consider what you have attempted to download / install in the last 2 days. Conduit has piggy backed in on something.
If using an alternative browser to IE, uninstall it and re install it but do not Import anything from IE.