Our PCs are infected by virus because most of we don't know when and how our PC is infected. If they knew about virus infection and take measures,then virus couldn't do much harm. As different virus programmed differently, so they outbreak differently. There are some symptoms which can give us forecasting about virus. They are :-
- Program Crash down or won't start: programs like task manager or registry editor won't start or doesn't show window. It may be worm that attached to various programs and infecting its codes.
- Unusual Traffic or slow net speed: Sometimes after closing browsers and other programs or applications you will notice computer is still uploading or downloading something. Or your net speed become slow for some unwanted reason. It may be some spyware work.
- Computer is not booting: If computer suddenly stop booting than you will understand malware has modified or breached your system files.
- PC Slowing down: some virus is made for making PCs slow. If you open task manager you will see your CPU using is almost 100%.
- Unwanted programs at start up: Some programs may begin at start-up which will open some unwanted applications or take you to some dirty advertisement.
- File associations: virus may change your .exe of other files which will cause crashing program.
- Security System disabled: Most malware, viruses disable your security systems and Firewalls to prevent them from deleting.
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