Think a situation where your computer is very badly affected with the virus and your virus-scanning software is not doing anything, what you will do in such situation?
Engineers format their Windows in such situation. But there is another way also. Just download a superdat file from McAfee website. You have to extract the content of the dat file then run the executable files in command prompt.
Just go to Direct link
Create a new folder in c:
Rename it to scan
Place the SuperDat file into c:\scan folder
Click on Start > Run > cmd
Press enter it will open command prompt
Type there following command:
cd c:\scan sdatXXX.exe /E
wait for a 2 minutes then run the following command
scan /ADL /ALL /SUB /CLEAN /REPORT C:\scan\virus.txt
This command will scan all drives and subdirectories and clean the infected file and also generate the report and save it in virus.txt file.
P.S. The SuperDat file generated on each day, so please download it on the day of virus scanning.
For better result do this procedure in Windows safe mode.