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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