Malware and cleanup: when a device starts misbehaving
Viruses, adware, spyware and ransomware explained by what they do to your machine, plus a cleanup sequence that works and a clear answer on when a reinstall is faster.
A computer that has started misbehaving is a particular kind of worry: the browser opens a search page you never chose, the fan runs hard when nothing is open, or a full screen warning insists you ring a number about a virus. Some of that is genuine malware, some is advertising junk that installed itself alongside something else, and some is a scam wearing the costume of an infection. Telling them apart is the whole job.
Start with the malware families and what each one does to a machine, since the right response depends entirely on the type. Most real cases turn out milder than they feel, usually pop ups and redirects from a hijacked browser, and often traced back to an extension with permission to read every page you open. When something needs more than a tidy up, follow the cleanup steps in order instead of installing three scanners and hoping.
The exception that changes everything is ransomware, where cleaning the machine does not bring your files back. How that ends was decided earlier, by whether you have a backup you have actually tried to restore from.
Articles in this hub
- Malware in plain English: the families and what each one doesViruses, worms, trojans, ransomware, spyware, stalkerware and adware explained by what they actually do to your machine, how each arrives, and which ones matter in 2026.
- Pop ups, redirects and adware: fixing a hijacked browserWhy your browser suddenly opens ads, where the change really lives (extensions, search settings, notifications), and how to remove it without installing another cleaner.
- Browser extensions: the permission that reads every pageWhy a small extension can see everything you do online, how good ones turn bad after being sold, and the audit that takes five minutes.
- How to clean an infected computer, step by stepAn ordered cleanup that works: disconnect, assess, scan from a position of strength, recover accounts, and decide honestly whether a reinstall is the faster answer.
- Ransomware explained: how it gets in and what to do firstHow a ransomware attack unfolds on a home or small business machine, why paying is a poor bet, and the backup arrangement that makes the whole thing survivable.