How to tell if your laptop or PC has a virus
Worried your Windows laptop or PC has a virus? Here are the signs, the differences between annoying adware and real threats, and what to do next.
The short version
Real damaging viruses are less common than the pop-ups make it seem. Most of what we see is one of three things: adware (annoying pop-ups and toolbars), browser hijackers (changed search engine, weird redirects), or scams pretending to be virus warnings. All three are fixable. The rare serious case is ransomware, and even that has options.
Signs of malware on Windows
- Pop-ups, fake warnings, or ads appearing on the desktop, especially when no browser is open.
- The laptop or PC is suddenly very slow or freezes often.
- Your browser homepage or search engine changed without you doing it.
- Programs or toolbars you did not install appearing in the Start menu or system tray.
- Files missing, locked, or renamed (a sign of ransomware, treated below).
- The fan running constantly even when you are not doing much.
- Network activity in the background when you are not using anything online-heavy.
- Windows Security keeps turning off by itself.
What to do first
- Do not enter passwords or payment details into a pop-up. Do not call a number it shows.
- Disconnect from the internet if you think your data is at risk.
- Make sure Windows and your security software are up to date.
- Back up important files if you can.
- Run a full scan with Windows Security (Settings, Privacy and Security, Windows Security, Virus and Threat Protection, Scan Options, Full Scan).
- Review installed programs (Settings, Apps) and uninstall anything you do not recognize.
- Check browser extensions and remove suspicious ones.
The ransomware case
Ransomware encrypts your files and demands payment. If you see a ransom note or files renamed with strange extensions, stop right away. Disconnect from the internet. Do not pay. Bring the machine in. Some ransomware variants have free decryption tools available, some can be removed without losing data, and in the worst case we can wipe the machine and restore from a backup if you have one. Acting fast matters.
Laptop vs PC: any difference?
Not much from a malware standpoint. The same threats affect laptops and desktops the same way. The only practical difference is that a laptop is easier to bring in to the shop, while a desktop tower may take a trip in the back seat or a home visit.
How to avoid the next one
- Keep Windows and your browser updated.
- Only download software from official sources. Avoid free download portals; they often bundle adware.
- Be skeptical of email attachments and links, even from people you know.
- Use a different password for important accounts. A password manager helps with this.
- Turn on two-factor authentication where it is offered.
- Back up your files regularly. An external drive or cloud backup is fine.
If the problem sticks around
Bring it in. We handle virus and malware cleanup, browser cleanup, and Windows reinstalls when needed. Most cleanups are $99 flat, no parts. Backing up your files is a paid add-on; please back up before any reinstall.
Common questions
Do I really need third-party antivirus on Windows?
Windows Security (built into Windows 10 and 11) is solid for most people. If you do high-risk browsing or want extra layers, a reputable third-party tool can help. Free ones are usually fine; expensive ones are mostly the same product with marketing on top. We can recommend something appropriate.
I think I have ransomware. What do I do?
Disconnect from the internet right now. Do not pay the ransom. Do not turn off the PC if files are still being encrypted. Bring it in or call us. Some ransomware can be removed cleanly; some requires restoring from a backup. The faster you act, the better the outcome.
I clicked a bad link. Now what?
If you did not enter any information, you are usually fine. If you entered a password, change it (and anywhere else you used the same password). If you entered card details, contact your bank. Then bring the laptop in for a check.
Is Windows Defender good enough?
Microsoft Defender (now called Windows Security) has improved a lot. For most users, it is enough when combined with safe browsing habits and timely updates. It does not stop everything, but no antivirus does.
How much does virus cleanup cost?
Usually $99 flat, no parts needed. Heavier infections that require Windows reinstall cost the same labor since the work fits in the standard repair envelope. Backing up your files is a paid add-on; please back up before any reinstall.
Should I just reinstall Windows myself?
If you are comfortable doing it, it usually works. Back up your files first, and have your Windows license key ready (most modern PCs have it tied to the hardware). If you would rather not, we handle it for $99 plus the time.
Want us to take a look?
Bring it in to 196 College St, or send a few details for a quote.