How to identify computer is affected by virus or not

Is your computer is slow? Is it virus?

    you can't consider "it should virus", It may the corruption of your operating system files or some unnecessary file was added to the start-up program. you can check it manually by the following procedures.

  Step1:-

       check from your task manager,

  1) open task manager (ctrl+alt+Del)

       (If your taskmanager is disabled it should virus)

  2) Open process tab

  3) Note down the CPU usage, some virus (65% of virus), occupies 100% CPU usages statics

  4) If the CPU usage is always 100%, your computer is affected by the virus and your can some time remove the virus manually using the following link Click Here

  Step2:-

   1) Open My computer

   2) Open any one of your Local Disk (eg, If open D Drive)

   3) Type the title bar, D:\Autorun.inf

   4) If any file open, you can consider 94%, your computer affected by virus