10 years ago?!? Back then yes it may have been a virus. With the coding capabilities of today a virus can do just about anything to your system if you are not protected. There are many types of viruses out there they either did not exist then or were very rare. Today there are Trojans, Malware, Ransomware, KeyLoggers just to name a few. They can take control of your computer or let other take control of it remotely without you knowledge. IT is always a good idea to run an antivirus application on your computer. IF you cannot afford one of the high end ones there are still a bunch of adequate freeware versions out there.