5. Suspicious network and hard drive activity
Combined with the other warning signs, if your hard disk is working excessively while no programs are currently running or if you notice that your external modem is always lit then you should scan your computer for viruses.
In the end, it’s best to know how malicious software affects your computer so you can take steps to rectify the situation as soon as possible. Regardless of whether or not your system has experienced these symptoms, it’s always smart to perform regular malware scans to ensure your business is safe.