You do not need to pay for software to keep your computer running well. Windows includes several built-in maintenance tools, and the best third-party options are free for personal use. The key is knowing which tools are genuinely useful and which are bloated suites that create more problems than they solve (most all-in-one PC optimizer suites fall into the second category). Here are the free tools that are actually worth installing and what each one does.
HWMonitor reads every hardware sensor in your computer and displays temperatures, voltages, fan speeds, and clock speeds in real time. It shows:
This is the first tool to open when you suspect overheating, when fans are running loud, or when you want to verify that a cooler is seated properly after installation. Download from cpuid.com — the standalone ZIP version does not require installation.
HWiNFO provides the same sensor readings as HWMonitor plus detailed hardware identification. It tells you the exact model of every component: CPU stepping and revision, RAM manufacturer and timings, GPU BIOS version, SSD firmware version, and motherboard chipset details. If you need to know exactly what hardware is in a computer without opening it, HWiNFO is the tool. It also has a logging feature that records sensor data to a CSV file over time, which is useful for tracking intermittent overheating or voltage drops during specific workloads.
CrystalDiskInfo reads the SMART (Self-Monitoring, Analysis and Reporting Technology) data from every hard drive and SSD in your system. SMART data includes:
CrystalDiskInfo gives each drive an overall health status: Good, Caution, or Bad. Caution means the drive is showing early signs of wear and should be backed up and replaced soon. Bad means failure is imminent. Check this quarterly on every computer — drive failures are the most common cause of data loss, and SMART data usually warns you weeks or months before the drive actually dies.
Windows Disk Cleanup is already on your computer and handles the most common junk files:
Run this monthly or whenever your drive is getting full. It is safe — it only removes files Windows confirms are no longer needed.
BleachBit is an open-source cleaner that goes deeper than Disk Cleanup. It clears browser caches, application temporary files, log files, and other junk that Disk Cleanup does not touch. It supports cleaning for specific applications: Chrome, Firefox, VLC, LibreOffice, and dozens more. The interface shows exactly what will be deleted and how much space will be freed before you confirm. BleachBit is the trustworthy alternative to CCleaner, which has become increasingly aggressive with upsells, bundled software, and data collection in recent years.
Windows Defender (officially Microsoft Defender Antivirus) is already running on every Windows 10 and 11 computer. It provides real-time protection against viruses, malware, and ransomware. It updates automatically through Windows Update. For most people, Defender is sufficient as a primary antivirus — it consistently scores well in independent testing and has no ads, upsells, or performance impact from unnecessary features. The full scan option (Windows Security, Virus and Threat Protection, Scan Options, Full Scan) checks every file on the drive and should be run if you suspect an infection.
Malwarebytes excels at finding threats that Defender misses, particularly adware, potentially unwanted programs (PUPs), browser hijackers, and spyware. The free version is an on-demand scanner only — it does not provide real-time protection (that is the paid Premium version), but you do not need it to because Defender handles real-time protection. Install Malwarebytes, run a scan when you suspect something is wrong or as a monthly check, and let it clean what it finds. The two programs complement each other rather than conflict.
Task Manager is more powerful than most people realize. Press Ctrl + Shift + Esc to open it, then click More Details if it opens in the simplified view:
Resource Monitor (search for it in the Start menu, or open it from Task Manager's Performance tab) provides more detail than Task Manager. It shows which specific processes are reading/writing to disk and to which files, which processes have network connections and to which IP addresses, and per-process CPU and memory with wait chain analysis. If Task Manager shows high disk usage but you cannot tell which files are being accessed, Resource Monitor tells you.
CrystalDiskMark measures the read and write speed of any drive. It runs several tests: sequential (large file) speeds and random (small file) speeds, both of which matter for different workloads. Use it to verify that a new SSD is performing at its rated speeds after installation, to compare before and after speeds when troubleshooting a slow drive, and to check if a USB drive or external SSD is performing as expected. A SATA SSD should show roughly 500 to 550 MB/s sequential. An NVMe SSD should show 2000 to 7000 MB/s depending on the generation. If the numbers are significantly lower, something is wrong (wrong slot, driver issue, thermal throttling).
MemTest86 tests your RAM for errors. Unlike the Windows Memory Diagnostic (which is built in but limited), MemTest86 runs outside of Windows from a bootable USB drive, testing every memory address thoroughly. Run it overnight — a complete test takes several hours. If it finds errors, one or more of your RAM sticks is failing and should be replaced. RAM errors cause random crashes, blue screens, and application errors that are extremely difficult to diagnose without a memory test because the symptoms appear random.
Several command-line tools built into Windows are essential for network troubleshooting:
ping 8.8.8.8 tests internet connectivity. ping google.com tests DNS resolution. ping 192.168.1.1 tests your router connectionSeveral categories of free tools cause more problems than they solve:
If your computer is slow, showing errors, or you suspect hardware problems, LuxuriousComputers Repair can run comprehensive diagnostics using professional tools, identify the actual cause of the problem, and fix it — whether it is a failing drive, overheating, malware, or a configuration issue that a free tool alone cannot resolve.