Viruses are small software programs that can slow down computers by piggybacking on other programs. They can damage files, degrade performance, and cause screens to display abnormal patterns without the user's knowledge. Symptoms of a virus include slowed speed, frequent system hangs, write protect errors, and strange screen movements. TECHSUPPORT with FBIVirusAlert offers round-the-clock support to remove viruses, spyware, and other software affecting performance. Their services include anti-virus installation, hardware tuning, troubleshooting, operating system updates, and optimizing security and disk performance.