After you open and run an infected program or attachment on your computer, you might not realize that you’ve introduced a virus until you notice something isn’t quite right. Some computer viruses alert you to their presence by putting an unexpected message on your screen.
Here are a few primary indicators that your computer might be infected:
A sudden decline in PC or network performance. Your computer runs more slowly than normal.
Applications on your computer don’t work correctly. Programs taking longer to start or running more slowly than usual.
Unexplained decreases in the amount of available memory or system resources
A sudden reduction in disk space or loss of files or data.
Computer stops responding or locks up often
Computer crashes and restarts every few minutes
Computer restarts on its own and then fails to run normally
Disks or disk drives are inaccessible
You can’t print correctly
You see unusual error messages
You see distorted menus and dialog boxes
Playing a tune or displaying a message
Loss of partitions (organization of disc space)
Unauthorized release of files, usually via e-mail
Disk accesses seem excessive for simple tasks
Access lights turn on for non referenced devices
Programs or files mysteriously disappear
Executable files change size and unexplained hidden files appear
All of these symptoms are common signs that your computer has a virus, although they could also be caused by hardware or software problems that have nothing to do with a virus.
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