Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsWindows 11 includes tools for malware protection, network security, device-health checks, storage cleanup, and a basic device overview. Each has a narrower job than a complete PC diagnosis: a clean status or scan does not guarantee immunity from threats, and a health report cannot repair failing hardware. Here is where to find the tools, what they do, and what to try when a problem persists.
What the built-in Windows tools do
These features are useful for different tasks; they are not competing versions of the same tool.
| Tool | Main purpose | Scope and limits |
|---|---|---|
| Windows Security | Access to antivirus, firewall, app and browser controls, and device security | Provides security controls and scan options; a scan is not a guarantee that a device is threat-free. If another antivirus app is installed and active, Microsoft Defender Antivirus turns off automatically. Microsoft Support |
| Firewall & network protection | Filter network traffic | Settings are organized by domain, private, and public network profiles. Microsoft Support |
| Device performance & health | Report on selected device-health indicators | Checks storage capacity, battery strain on devices with a battery, app or software failures and updates, and the Windows Time service. It does not perform a comprehensive hardware diagnosis. Microsoft Support |
| Storage Sense and Disk Cleanup | Free storage, including space that may be needed for updates | Storage Sense manages selected cleanup targets on the system drive; it does not resolve every performance issue. Microsoft Support and Microsoft Support |
| PC Health Check | Provide a Windows 11 device overview | Can show update status, startup time, storage use, specifications, and battery capacity information on supported devices. It is not a malware scanner or a complete performance diagnosis. Microsoft Support |
Use Windows Security to check protection
Review the security areas
- Open Start, search for Windows Security, and open the app.
- Review the status areas, including Virus & threat protection, Firewall & network protection, and any other sections available on the device.
Microsoft describes the app as “a comprehensive security solution integrated into Windows, designed to protect your device and data from various threats.” That description is from Microsoft Support’s Windows Security App Overview; it should not be read as a promise that a PC is immune to threats.
Run a scan
In Virus & threat protection, choose the quick-scan option to check common locations. For a suspicious individual file or folder, open File Explorer, right-click the item, and choose Scan with Microsoft Defender. On Windows 11, that command may be inside Show more options. A scan checks for threats; it is not a substitute for keeping protection and software up to date.
#1 Best Overall
If another antivirus product is installed and turned on, Microsoft Defender Antivirus turns off automatically. Check which antivirus is active before installing another product; do not assume that adding a second one will add another active Defender scan layer.
Keep the firewall on and handle blocked apps safely
Open Windows Security > Firewall & network protection to see the active network profile and manage firewall settings for domain, private, and public networks. Public Wi-Fi is generally less trusted than a private home network, so the profile matters when reviewing access.
If a needed app is blocked, Microsoft advises allowing that app through the firewall rather than turning the firewall off. Disabling the firewall removes network filtering instead of addressing the specific app rule. See Microsoft’s firewall and network protection guidance.
Read the Device performance & health report
In Windows Security, open Device performance & health. Microsoft says the report runs a scan when opened and checks selected areas:
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →- Storage capacity: available space.
- Battery: strain, on devices that have a battery.
- Apps and software: failures or updates that may need attention.
- Windows Time service: whether this service has an issue.
A green check means the report has no recommendation to show at that time; it does not certify the entire PC as fault-free. Yellow means attention is recommended. Follow the specific recommendation shown rather than treating the color as a diagnosis. A workplace or school administrator’s policy may hide this view. Microsoft’s Device performance and health guidance describes the categories and status indicators.
Free up space with Storage Sense
Storage Sense is a configurable cleanup feature for the system drive, not a general-purpose deletion of everything Windows considers old. Review its targets and schedule before enabling it, especially if you keep files in Downloads or cloud-backed folders.
- Open Settings > System > Storage.
- Open Storage Sense and turn it on if you want Windows to manage eligible files.
- Inspect when it runs and which cleanup targets are selected before accepting the configuration.
With default settings, Storage Sense may run when the device is low on space and remove unnecessary temporary files. Recycle Bin items may be removed after a period. Downloads and cloud files are left alone unless you configure Storage Sense to manage them. Review those choices before cleanup so you do not remove files you intend to keep. Microsoft explains the options in Manage drive space with Storage Sense.
Disk Cleanup is another option for freeing space. Microsoft lists Storage Sense and Disk Cleanup among ways to make room for Windows updates, but neither is a universal fix for slow performance. See Free up space for Windows updates.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Use PC Health Check for a Windows 11 overview
PC Health Check is separate from Windows Security. On Windows 11, it can provide an overview that includes Windows update status, startup time, storage use, device specifications, and battery capacity information where supported. Its battery information is not available for every device, and it does not scan for malware or diagnose every cause of poor performance. See Microsoft’s PC Health Check instructions.
When cleanup does not solve the problem
Recurring errors, slow startup, declining battery life, low storage, or persistently high CPU, memory, or disk use may call for targeted troubleshooting rather than another cleanup. Microsoft identifies these as signs that a PC may be aging or having trouble, not proof that it needs replacement. Microsoft’s guide to knowing when it may be time for a new PC discusses those warning signs.
- High CPU, memory, or disk use: Open Task Manager and look for a process that remains unusually busy. Identify the process before closing it or changing its settings.
- Slow startup: Review startup programs and disable only items you recognize and do not need at sign-in.
- Update trouble: Check Windows Update and make room if storage is low; use Microsoft’s update storage guidance if needed.
- Recurring errors or hardware symptoms: Back up important files, then seek appropriate manufacturer-authorized or qualified repair advice if the issue persists. Microsoft recommends keeping important files backed up in its computer security guidance.
Windows cleanup tools can reclaim space, and security tools can check defined threats and network protections. They do not promise a one-click speed increase or repair a failing battery, drive, or other hardware.
Windows 10 support status
Windows 10 support ended on October 14, 2025. Microsoft says free software updates through Windows Update, technical assistance, and security fixes ended on that date. Windows 10 does not stop running, but continuing to use it means it no longer receives those support benefits. The available tool labels and options can vary by Windows version, device capability, locale, and administrator policy. See Microsoft’s guidance on protecting a PC from unwanted software and check Microsoft’s current Windows lifecycle information before making a support decision.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
