My computer is running very slow. What can I do to speed it up?

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Prompt Starters

1. My computer is running very slow. What can I do to speed it up?
2. I can't connect to my Wi-Fi network. How do I fix this?
3. My phone's battery is draining too quickly. What should I check?
4. I'm getting an error message when I try to open a software application. What does it mean?