I've spent more hours than I care to admit diagnosing stubborn Windows problems: sluggish laptops, desktop crashes, weird startup behavior, you name it. Over the years, I've used plenty of different tools, from flashy "PC optimizers" that promise too much, to hidden system utilities that actually deliver. What I've learned is that many of the best ones are lightweight, reliable, and give you a clear view of what's really happening under the hood, so to speak.
Instead of relying on Windows' built-in diagnostic tools and utilities, or worse, having to scramble to find the right application or utility when something breaks, I keep some trusted, third-party tools on my USB drive. These four tools are free, lightweight and portable, and they're always helpful when Windows starts acting out.
Sysinternals: The Free Microsoft Windows Toolkit
If you've spent any amount of time digging into Windows problems, then you've likely heard of Sysinternals Suite . The handy toolkit was originally built by Mark Russinovich and Bryce Cogswell, then it was later acquired by Microsoft. It consists of a free collection of utilities that give you a deeper layer of insight into Windows that you can't quite get with Windows built-in tools and utilities.
The suite has dozens of utilities, but these are the three I use primarily.
Process Explorer
Process Explorer is a more advanced version of Task Manager . It shows you exactly what processes are running, what resources they're using, along with which files or DLLs they've locked, and other interesting details. If a system seems sluggish or bogged down, or you can't delete a file, this is a good place to start your analysis.
Autoruns
Windows has a habit of loading things in the background, and Autoruns gives you all the details. It shows every startup item, scheduled task , and shell extension. This tool makes it easier to identify bloatware or malware in your system.
Process Monitor (ProcMon)
This utility gives deep insight into Windows processes. It logs real-time file system, registry, and process activities. If you're troubleshooting an application that keeps crashing, or having application installation problems, this tool can help you track down the problem.
Everything: My Go-To When Windows Search Lets Me Down
Where Sysinternals helps analyze what's happening in Windows, Everything helps search my hard drives. Yes, Windows search has gotten better , but it's still slow, resource-intensive, and tied to Bing and Start menu results. When I need to know where a file is, especially on someone else's PC, I use Everything.
Unlike Windows built-in search, Everything doesn't crawl the contents of your files. Instead, it quickly builds an index of filenames and paths, resulting in nearly instantaneous search results as you type. There's no lag, or background indexing, just fast search results. If you're like me, after you use it a few times, Windows search will feel slow and clumsy.
HWiNFO: A Utility for Checking Temps, Fans, and Voltages
While Sysinternals is for monitoring, diagnosing, and troubleshooting Windows applications, processes, and the operating system itself, HWiNFO is a free utility that monitors what's going on with your PC's hardware in real-time. You can monitor fan speeds, voltages, clock rates, CPU temps, RAM, and more.
An overheating processor can cause your system to slow down, crash or behave strangely. These symptoms can look like a software glitch, or malware, but with HWiNFO, I can put my PC under a load and monitor my CPU temps and other hardware to make sure they're operating within specs.
I also use it to establish a baseline. When my wife tells me her computer is running slow, I can run HWiNFO and immediately see things like whether the CPU is boosting properly, the RAM is stable, and the system is running within spec. For troubleshooting physical problems, it's a great free resource.
CrystalDiskInfo: Catch a Failing Drive Before It Dies
If you've owned a computer long enough, you've experienced a hard drive failure . To me, these are one of the most frustrating Windows problems you can run into. It usually starts small, files taking longer to open, slower boot times, or random hangs after startup. If you don't catch it early, it can end in total drive failure and lost data. That's why I keep CrystalDiskInfo on my flash drive.
This free tool reads the Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.) data that is built into hard drives and SSDs, then turns that data into something simple for everyone to grasp, a Good, Caution, or Bad status. Of course, it does more than that, it also shows temperatures, error counts, reallocated sectors, and more. This data has helped me identify the red flags that indicate a hard drive was ailing or on its way out, giving me the time to back up the data properly.
Windows comes with plenty of troubleshooting tools built right in , but when things get wonky, I find they don't often give the necessary level of detail to identify and resolve the problem. That's why I always keep these four tools on my troubleshooting flash drive. They help me cover most of the common failure points on my Windows PC.
