Getting a few more years out of an older PC
The small set of changes that genuinely help an ageing machine, and the category of software that makes it worse while claiming to fix it.
An older machine usually feels slow for three reasons: it is full, something is running at startup that nobody chose, or the storage is failing. All three are diagnosable in minutes. The popular response, installing a cleaner or a booster, addresses none of them and adds a fourth process.
This guide is deliberately short. Most of the value comes from removing things rather than adding them.
Measure before changing anything
Find out where the space went with a tool that reads the filesystem directly rather than walking every folder. Check drive health before trusting the disk with anything else; a SMART warning is a reason to back up first, not to optimise. Then look at the startup list in Task Manager and disable what you can name and do not need.
If the machine has a mechanical hard drive and no solid-state storage, replacing it is the single change with the largest effect. No software on this site approximates it.
The tools this step calls for, with their real licence and platform details:
| Program | Licence / price | Platforms | Why it is on the list |
|---|---|---|---|
| WizTree Publisher's site ↗ | Free for personal use | Windows | Reads the master file table directly and shows you what is eating your disk in seconds, not minutes, with a treemap view. The fastest way to find the 40 GB you did not know you had. |
| CrystalDiskInfo Publisher's site ↗ | Free · Open source | Windows | Shows the SMART health of every drive in plain language, so you get a warning before a disk dies instead of after. Check any second-hand laptop with this before you hand over money. |
| CrystalDiskMark Publisher's site ↗ | Free · Open source | Windows, macOS | Measures real read and write speed on a drive so you can tell whether that new SSD is actually performing as advertised. Run it once after any upgrade, then forget about it. |
Choose lighter tools where they exist
A fast standalone PDF reader opens a document before a full office suite has finished loading. A minimal media player reads a file without a library scan. A small text editor handles a 200 MB log file without slowing to a crawl. These are not compromises; they are the right tools for a machine with less headroom.
The tools this step calls for, with their real licence and platform details:
| Program | Licence / price | Platforms | Why it is on the list |
|---|---|---|---|
| Sumatra PDF Publisher's site ↗ | Free · Open source | Windows | Opens PDFs in under a second, remembers where you stopped reading, and has exactly no upsell. It also reads epub, mobi and cbz. There is nothing to configure, which is the whole appeal. |
| mpv Publisher's site ↗ | Free · Open source | Windows, macOS, Linux | For people who care about video quality: precise scaling, smooth playback of 4K and high frame rate files, and keyboard control of everything. There is no settings window, which is the point and also the problem. |
| Notepad++ Publisher's site ↗ | Free · Open source | Windows | Replaces Notepad for anything involving line endings, encodings, regex search or large log files. Light enough to open in a fraction of a second, which is why it survives next to VS Code. |
| Greenshot Publisher's site ↗ | Free · Open source | Windows | The lightweight option if you want one fixed hotkey that grabs a region, opens an editor and copies to clipboard. Older and quieter than ShareX, which for many people is exactly right. |
What to refuse
Registry cleaners, RAM boosters, driver updaters and PC optimisers do not restore performance on a modern operating system. They add a startup item, a tray icon and often a subscription prompt. Windows already manages memory and drivers better than a third-party guess can. The same goes for a second real-time antivirus scanner.
The tools this step calls for, with their real licence and platform details:
| Program | Licence / price | Platforms | Why it is on the list |
|---|---|---|---|
| BleachBit Publisher's site ↗ | Free · Open source | Windows, Linux | Clears caches, logs and traces from dozens of applications, and shreds files properly. Only useful if you understand what you are deleting. Windows' own Disk Cleanup covers the safe basics. |
| Malwarebytes Publisher's site ↗ | Free + paid tiers | Windows, macOS, Android, iOS | Keep the free version as a second opinion when something feels wrong. Windows Defender already handles real-time protection well enough that paying for a second always-on scanner is mostly redundant. |
Mistakes to avoid
- Treating a benchmark score as a health check. Speed and SMART health are different readings from different tools.
- Deleting temp folders before finding out where the space actually went.
- Running an aggressive leftover-removal pass after every uninstall, which eventually breaks a shared component.
Questions people ask
Is a clean reinstall worth it on an old machine?
Often yes, if the hardware is healthy. It removes years of accumulated startup items in one afternoon; take the backup first.
Will more RAM help?
If the machine is constantly swapping to disk, yes. If it is swapping because a drive is failing or the disk is full, fix that first.
Related guides
Or see all guides and category explainers.
How to read this page. How to read this page. Platform, licence and publisher details come from our directory data. Where an independent review, audit or survey is mentioned, it is summarised in our own words with the source named and linked; our /sources page sets out that policy. The recommendation, the trade-offs and every 'skip it if' line are our editorial judgement. We do not run benchmarks, publish measured performance figures or host installers, and every download link goes to the publisher's own site. If a detail is out of date, our About page explains how to tell us.