My Anti-Virus Program and Why I Use It
Saying you made a program, would you protect it?
What if you spent tens of millions of dollars making this program? Would you spend millions to protect it?
That’s just what Microsoft Security Essentials is! ( I have no idea what they have spent building it 
Here is the link to find out if you are running 32 or 64 bit Operating System.
All the best!
Chip
