7 Signs You Have Malware and How to Get Rid of It PC acting strange? These warning signs could mean that your PC's security has been compromised. Here's what to do. Computers are complicated devices. They don't always do precisely what you expect. Sometimes an unexpected behavior is just a glitch; other times, it's an outward and visible sign of an inward and terrible malware infestation. If you notice any of these seven warning signs, it could mean that malware has compromised your system's security. The fact that you've got malware protection installed doesn't mean you can ignore these warning signs. Software isn't perfect, and sometimes a brand-new malware attack can slip past your security. 1. Popup Ads Start Popping Up Everywhere While not as common as they used to be, adware programs bombard their victims with advertisements. Sometimes they're ads for legitimate products, netting an affiliate fee for the adware perpetrator. Oth...