PC Troubleshooting Checklist

What this tool does

Use this browser-based PC troubleshooting checklist to narrow down common Windows computer problems. Select the symptoms you are seeing, answer a few diagnostic questions and get a prioritized list of safe checks to try. The tool focuses on low-risk troubleshooting such as updates, storage, startup apps, browser checks, network basics and overheating signs. It does not make changes to your computer.

Computer problems often overlap: a nearly full drive can make a PC feel slow, overheating can cause random shutdowns, browser extensions can cause page crashes, and network problems can look like app problems. This checklist groups symptoms into likely issue areas and recommends safe next steps in an order that avoids unnecessary changes.

Useful for

• Troubleshoot a slow Windows computer before paying for repairs.
• Check common causes of random crashes, freezes and restarts.
• Review internet and browser problems step by step.
• Identify when a problem is likely beyond basic DIY troubleshooting and may need expert help.

How to use it

1. Select every symptom that applies to your computer.
2. Answer the quick diagnostic questions about storage, updates, temperature, startup and internet behavior.
3. Run the check to see the most likely issue categories and recommended actions.
4. Try the safest actions first and stop if you see signs of hardware damage, data loss or repeated system failure.

Worked examples

Common mistakes to avoid

• Installing random “PC cleaner” or registry-cleaner software before identifying the actual problem.
• Ignoring a drive that is almost full or showing signs of failure.
• Continuing heavy use when a laptop is overheating or shutting down unexpectedly.
• Resetting Windows or deleting files before backing up important data.

Before you use the result

• Check Windows Update and restart after important updates are installed.
• Confirm there is enough free storage on the system drive.
• Test whether the problem happens in more than one browser or application.
• Back up important files before any major reset, repair or hardware work.

Edge cases and limitations

• A failing SSD, RAM problem or power-supply issue can look like a software problem and may require hardware testing.
• Malware can cause slowness, pop-ups, redirects and unusual background activity; use reputable security software rather than unknown cleanup tools.
• Corporate computers may be managed by an IT department and should not be changed outside company policy.
• If the computer does not power on, smells burnt, has liquid damage or makes unusual clicking noises, stop using it and seek hardware help.

Practical tips

• Restart first if the PC has been running for a long time; many temporary issues clear after a proper reboot.
• Change one thing at a time so you know which action actually fixed the problem.
• Write down any error message exactly as it appears before restarting or closing it.
• Keep backups current before troubleshooting problems that could involve storage failure.

Frequently asked questions