Advance Computer and Virus

Computer is an electronic device which can accept the data from user through input device and hold it for sometime to process the data and show to result in a output device.

• F1 to F12-Function key
• A to Z-Alphabet key
• Lab Enter Alt.etc-Operating key
  
• @,#,!,$,%,^,&,etc-Symbol key
• 0 to 9-Numerical key
• Alt65Alt90-A to Z
• Alt95Alt22-a to z
• Alt2 to Alt20-symbol

Virus
(1) Worm virus (which attached with software)
(2) Boot Sector Virus
(3) Micro Virus
(4) Scripted Virus

Some dangerous programmer virus are as follows:
(1) Melisa
(2) DB M
(3) I Love You
(4) I raj on Horse
(5) Happy 99
(6) Nuclear
(7) Concept


Symptoms of Virus Infections:

1. Programs loading and execution take unusually long times.
2. Changes in files and programs size color.
3. Memory and disk spaces are suddenly reduced.
4. Files disappear and strange files may process.
5. Programs may fail to occur.
6. Computer reboots in the middle of the process.
7. Computer hangs on.
8. Disk drives lit on unusually.