5 Signs Your Computer Has a Virus and What to Do
Security4 min read
December 9, 2025 • By JTG Systems
Malware and viruses can cause serious damage to your computer and compromise your personal data. Knowing the warning signs can help you take action before its too late.
If your computer suddenly becomes sluggish, programs take forever to load, or everything feels unresponsive, malware could be running in the background. Malicious software often consumes your system resources without your knowledge, using CPU and memory for malicious activities.
Pop-up ads appearing randomly, especially when youre not browsing the web, are a classic sign of adware infection. These ads often appear in unusual places, are difficult to close, and may promote suspicious products or services.
When programs open, close, or crash without your input, something is wrong. Malware often interferes with normal operations, causing applications to behave unpredictably. You might notice your browser homepage changing or unfamiliar icons appearing on your desktop.
Notice your internet is slower than usual or your data usage has spiked unexpectedly? Malware often communicates with remote servers, sending your stolen data or receiving instructions. Check your network activity monitor for unexplained data transfers.
If your antivirus suddenly turns off and wont restart, or Windows Firewall settings change mysteriously, malware may be actively disabling your protections. Some sophisticated viruses specifically target security software to avoid detection.
At JTG Systems, we provide complete virus removal services including malware cleanup, spyware removal, and protection setup. Our technicians use professional-grade tools to thoroughly clean your system and secure it against future infections.
Same-day virus removal service available. Call (905) 892-4555 for immediate assistance.