What can be done if software used to remove files and update drivers goes wrong

Q: I have a Dell T5500 running Windows 10 with all updates done automatically. At the end of December, I got an email from CCleaner that it was time to renew my license and let it update my drivers, removed unneeded files, etc. I agreed, and CCleaner did its thing. But when the computer restarted, my Dell U2719D monitor resolution of 2560×1440 was reduced to 1024×768 with no option to reset the resolution. Carbonite was unable to do its daily backups. The computer takes 20 minutes to boot up. 

I tried to do a Windows system restore to a Dec.