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Almost anything odd a computer may do, can blamed on a computer "virus," especially if no other explanation can readily be found. Many operating systems and programs also do strange things, therefore there is no reason to immediately blame a virus. In most cases, when an antivirus program is then run, no virus can be found.
A computer virus can cause unusual screen displays, or messages - but most don't do that. A virus may slow the operation of the computer - but many times that doesn't happen. Even longer disk activity, or strange hardware behavior can be caused by legitimate software, harmless "prank" programs, or by hardware faults. A virus may cause a drive to be accessed unexpectedly and the drive light to go on but legitimate programs can do that also.
One usually reliable indicator of a virus infection is a change in the length of executable (*.com/*.exe) files, a change in their content or a change in their file date/time in the Directory listing. But some viruses don't infect files, and some of those which do can avoid showing changes they've made to files, especially if they're active in RAM.
Another common indication of a virus infection is a change to the reassignment of system resources, unaccounted use of memory or a reduction in the amount normally shown tor the system may be significant.
in short, observing "something funny" and blaming it on a computer virus is less productive than scanning regularly for potential viruses, and not scanning, because "everything is running OK"
Is equally inadvisable.
3.2 What to do when you find viruses?
First thing what you should do when you find virus is count to ten and stay cool. You should keep notes on what you do and write down what your virus programs and you computer tells you. If you are not sure what to do, you should call the administrator for future action. In some cases it is not good to start you computer from hard disk, because the virus may active and then do some harm.
Second, make sure that you should get sure that it is virus and what virus it is. It is important to know what kind of virus we are dealing with. Companies that make anti-virus programs knows what different viruses does and you can ether call them and ask about that viruses or you can go to their web pages and read about the virus you have.
When you start you computer you should do it from a clean (non-infected) floppy diskette and after that run the virus program. The boot diskette should be write protected so that virus can not infect the boot diskette too.
It is good to take a backup of the file that was infected. Virus program could do some damage to the file and that is why it is good to have a backup.
It is good to let you administrator to know about the virus, so viruses would not spread around so much. In TKK PC classes are protected by anti-virus program and that virus program reports to a person, responsible for virus protection.
4. How to protect from viruses
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