To fix a slow computer, several effective steps can be taken:

• Restart the computer to clear RAM and stop unnecessary background processes.
• Check the Task Manager for resource-heavy programs and close or uninstall unnecessary ones.
• Disable unnecessary startup programs to reduce background resource use.
• Free up disk space by deleting unused files and uninstalling unused programs.
• Update the operating system and device drivers for better performance and compatibility.
• Pause or limit syncing services like OneDrive that can consume resources.
• Defragment the hard drive if using an HDD to improve data access speed.
• Run antivirus scans to remove malware that may be slowing down the system.
• Ensure the computer is well-ventilated to prevent overheating and performance throttling.

These steps collectively help optimize CPU, RAM, and disk usage, speeding up the computer's overall performance.