- Inexplicable system crashes
- Programs taking significantly longer to start
- A decrease in computer processing speed without reason
- Excessive attempts to access the hard drive, even for simple tasks
- Files are suddenly corrupted or don't work properly
- A sharp reduction in available memory and system resources for no apparent reason
- Programs or files that are suddenly missing
- Programs or files that are created without your permission
- A sudden reduction in available hard drive space
- The changing of a volume or disk's name
- Strange messages or displays on your monitor
- The playing of unusual sounds or music at random times
What is a virus?
How can I protect my computer from viruses?

