Which of the following is the FIRST step in troubleshooting?

A customer reported that a home PC with Windows 10 installed in the default configuration is having issues loading applications after a reboot occurred in the middle of the night.

Which of the following is the FIRST step in troubleshooting?
A . Install alternate open-source software in place of the applications with issues
B . Run both CPU and memory tests to ensure that all hardware functionality is normal
C . Check for any installed patches and roll them back one at a time until the issue is resolved
D . Reformat the hard drive, and then reinstall the newest Windows 10 release and all applications.

Answer: C