Jak rozpoznać objawy infekcji wirusowej w komputerze

Even with installed antivirus software, malware can slip through and affect system behavior. If your PC starts acting strangely, slows down, or shows unfamiliar programs and messages, run a full scan even if the antivirus hasn’t issued a warning.

Spowolnienie działania komputera

All PCs become slower over time as more programs are installed, but a sudden, severe and persistent slowdown often signals a virus. Whether the lag appears during boot, when opening applications, or while loading web pages, it may be caused by malware hijacking CPU power or Internet bandwidth.

Częste awarie i zawieszanie się

Occasional freezes are usually due to buggy software, but multiple crashes per day or crashes across many different programs can indicate a virus. Malware can corrupt or delete essential system files, leading to instability. If a scan returns clean, the problem might be failing hardware.

Wysokie zużycie dysku lub procesora

It’s normal for the hard drive to work occasionally in the background, but continuous activity for hours may mean a virus is running silently. Malware that hogs CPU resources can also make the fan run loudly. To check CPU usage, right‑click the taskbar, open "Task Manager", click "More details" if needed, and watch the "CPU" column. If the usage stays above 20 % for several minutes with no programs open, a virus is likely. Stubborn programs can also cause high CPU load; reboot or select them in Task Manager and click "End task".

Nieznane programy i wyskakujące reklamy

Websites legitimately display ads, but a sudden increase in ads—or ads appearing while you’re not browsing—can be a sign of infection. Malware may also add unfamiliar icons to the taskbar or launch programs at startup. Most often this is adware (unwanted but non‑malicious), yet some adware behaves like a virus, degrading performance or hijacking the browser. If your antivirus doesn’t detect anything, install and run a dedicated anti‑malware tool.

Uwaga

Informacje w tym artykule dotyczą systemu Windows 8. Mogą się nieco różnić w innych wersjach systemu.