Virus:A virus is a small malicious program that multiplies and is capable to attach itself to other programs after being executed. It then causes an infection and causes various degrees of damage to your computer.
W32.Sens.A is a virus that can spread by infecting various system files and by creating an entry on the registry so that the virus runs each time that Windows is started. W32.Sens.A is dangerous in that it may steal your personal and financial information data from a compromised machine, and send this information to a remote server. This can lead to identity theft.
Technical details (How to remove W32.Sens.A(pop up))