3.1 - Troubleshooting Windows performance and startup
CompTIA A+ Core 2 objective 3.1 covers troubleshooting common Windows performance and startup problems. When a PC is very slow with many programs launching at boot, the best first step is to disable unneeded startup programs. When an application hangs and won't close normally, end the task in Task Manager. When Windows won't boot normally after a change, start in Safe Mode, which loads only a minimal set of drivers so you can undo the change or remove what broke it. The exam rewards choosing the least invasive effective step first rather than jumping straight to a reinstall. Expect scenario questions that describe a slow, frozen or non-booting system and ask for the best next action, in the correct troubleshooting order.
Slow + many boot programs = disable startup items. Frozen app = End task (Task Manager). Won't boot after a change = Safe Mode (minimal drivers), then undo. Rule: least invasive fix first, reinstall last.
Practice questions
1. A PC randomly reboots and shows different BSOD codes. After updating drivers, what hardware test is MOST useful?
- Defragment the system disk
- Reset the BIOS to its defaults
- Run a memory diagnostic on the RAM (correct answer)
- Reinstall the web browser
Random reboots with varying BSOD codes often indicate failing RAM — run Windows Memory Diagnostic/MemTest.
2. Windows reports 'low disk space' on C: and runs slowly. Which is a safe first step?
- Delete the Windows System32 folder
- Run Disk Cleanup to remove temp files (correct answer)
- Reformat the entire C: drive
- Turn off the virtual memory swap file
Disk Cleanup safely removes temp files, caches and old updates to free space. Never delete System32.
3. A PC shows the wrong date/time and some HTTPS sites give certificate errors. What likely fixes it?
- Reinstall the whole web browser
- Correct the date/time and NTP sync (correct answer)
- Physically replace the graphics card
- Turn off the host software firewall
A wrong clock breaks certificate validity checks. Fix the date/time and enable automatic time sync (and check the CMOS battery).
4. After OS updates, a PC fails to boot. Which recovery option reverts the system to an earlier working point?
- Disk Cleanup
- System Restore (correct answer)
- Defragmentation
- Task Manager
System Restore rolls back system files/settings/drivers to a prior restore point without touching personal files.
5. A Windows PC is very slow and has many programs launching at boot. What is the BEST first fix?
- Reinstall the whole Windows OS
- Disable unneeded startup programs (correct answer)
- Run a full antivirus scan first
- Increase the virtual memory size
Too many startup apps slow boot and steal resources. Disable them in Task Manager → Startup before drastic steps.
6. A phone's battery drains unusually fast after installing several apps. What is the BEST diagnostic step?
- Replace the phone's display panel
- Check battery usage stats for the culprit app (correct answer)
- Disable the SIM card in settings
- Reformat the microSD storage card
Battery usage settings reveal which app drains power; restrict, update or uninstall it before hardware steps.