Make Warnings from Notepad:

Open a notepad and type ,

• lol=msgbox ("Warning Virus detected on your system.Click YES to Format hard disk else click NO to Format hard disk after Restart",20,"Warning") 
• Then Save this file as LoveCalculator.VBS and then send it to your friend or check it yourself. 

Description:
First argument of msgbox : You can type whatever you want.
Second argument of msgbox: You cannot change the value 20.
Third argument of msgbox : You can type whatever you want.
You can name the file, whatever you want but it should be of .VBS extension
Remember, this file is completely harmless.