A computer virus is a piece of software that when executed (like when you double click a file or open an attachment) copies itself to other computer programs and changes the computer code. When this succeeds, as it probably will if your antivirus is non-existent or out of date, then you are "infected" with a computer virus.
Norton Security lists these symptoms of a computer virus:
- A computer program disappears from its memory, especially if there is no known removal of the program.
- Unfamiliar music or sounds unexpectedly starts playing through the speakers.
- Icons appear on the desktop unrelated to any programs that are currently being installed, or new icons seem to appear when no software has been installed.
- An antivirus program will not run, or a new one will not install properly or at all.
- Previously installed antivirus programs will suddenly disable and can not be restarted.
- Files that have been recently opened suddenly have more than one extension, such as .exe, .vbs, .gif, or .jpg.
- Dialog boxes and menus seem to be distorted or different.
- Unusual error messages will pop up.
- Items are not printing correctly.
- Disk drives or disks become inaccessible.
- An application or applications are not working correctly.
- The computer isn’t running as well as usual, or the computer reboots on its own.
- The computer restarts continuously.
- The computer locks up frequently or stops responding.
- The computer seems to be losing processing speed.
Remember, some of these symptoms can be attributed to other factors, such as hardware.
So what do you do?
Install and/or update antivirus
Run a thorough scan
This should remove the virus. I recommend checking the AV logs for more information. Contact BSCANS if you need more assistance.