Explanation
Isolating the machine from the network is a good practice when troubleshooting a PC that is suspected of being infected with malware. This can prevent the malware from spreading to other devices on the network or communicating with external servers that may control or exploit the malware. Isolating the machine can be done by disconnecting the network cable, disabling the wireless adapter, or blocking the network traffic with a firewall.

Explanation
If a technician suspects high disk I/O, the technician should use the Resource Monitor (resmon.exe) to identify the process that is causing the high disk I/O1. Resource Monitor provides detailed information about the system's resource usage, including disk I/O1. The technician can use this information to identify the process that is causing the high disk I/O and take appropriate action1.

Over time, especially with frequent opening, modification, and saving of large files, a hard disk drive (HDD) can become fragmented. Fragmentation occurs when pieces of individual files are scattered across the disk, leading to longer read and write times, whichcan significantly slow down the computer. Disk defragmentation reorganizes these fragmented files, placing the pieces closer together on the drive, which improves access time and overall system performance.
Disk Defragment:Using the Disk Defragment tool on a Windows 10 system with an HDD will help in reorganizing the data more efficiently, thus potentially remedying the slow performance issue.
The Registry Editor (B) is a tool that allows for the viewing and editing of the Windows registry and is generally not used for performance improvement but rather for system settings and configuration adjustments.
System Information (C) provides a detailed look at the computer's hardware and system details but does not offer tools for performance improvement. Disk Cleanup (D) can help free up space on the hard drive by removing temporary files and system files that are no longer needed, which can indirectly improve performance but is not the primary tool for addressing fragmentation.

Explanation
The risk analysis should be performed before it's taken to the board. The step after the board approves the change is End User Agreenment Reference:
https://www.youtube.com/watch?v=Ru77iZxuElA&list=PLG49S3nxzAnna96gzhJrzkii4hH_mgW4b&index=59

Explanation
Calibrating the phone sensors is a step that can troubleshoot the issue of screen not autorotating on a mobile device. Screen autorotation is a feature that automatically adjusts the screen orientation based on the device's position and movement. Screen autorotation relies on sensors such as accelerometer and gyroscope to detect the device's tilt and rotation. Calibrating the phone sensors can help fix any errors or inaccuracies in the sensor readings that may prevent screen autorotation from working properly. Enabling the touch screen, reinstalling the operating system, and replacing the screen are not steps that should be done next to troubleshoot this issue.