Basic Steps If PC Is Infected With Virus

Step by step

1. Boot your PC in safe mode by pressing F8
2. Go to "My Computer" right click on it then select "Properties"
3. There are General tab,Computer Name tab,Hardware tab, Advanced tab, System Restore tab and etc.Click on System Restore tab, then at the bottom, click "Apply" then click "Ok".REASON: Turn off system restore point is to prevent viruses from being spreaded to other drive.
4. Go to "Control Panel" and select "Automatic Updates".
5. Turn "off" Automatic Updates then click "Ok" at the bottom
6. Delete all the browser cookies, cache, history and passwords.REASON:Some cookies contain viruses which keep on replicate the same files making your pc hang.For Mozilla Firefox users, go to "Tools" menu, at the submenu, select "Clear recent history" then it will pop up a window,select "Everything" then press the button "Clear now".For Internet Explorer users, go to "Tools" menu, select "Delete Browsing History" then it will pop up a window.Check all the boxes then click "OK".
7. Go to "Start" and choose "RUN" then type "regedit"  
8. It will pop up a Registry Editor window.You will see 5 root directories.Choose  and expand "HKEY_LOCAL_MACHINE" directories.
9. Now, look for SOFTWARE directory then expand it.
10. Search for MICROSOFT directory and expand it then look for WINDOWS directory.Expand it.
11. Expand the Current Version directory look for RUN directory.You will see other folder below  RUN folder which will have RUNONCE, RUNONCEEX.Delete all folder start with RUNxxxxEXCEPT RUN folder.
12. Below RUN folder after deleting RUNxxx folder is SETUP folder.DON'T delete.Your task is finished.
13. RUN your anti virus program with latest update definition.Update antivirus program before  proceed  with scanning.If virus is detected, DELETE it.After a complete scan, run the antivirus all over again to ENSURE your pc is free from infections.
14. Reboot your PC.