Computers-Just when you thought it was safe?

I get so much Spam-Most of which goes directly to the spam folder and I never see it-  I thought that I was immune. 

Free Bug Eliminator Software!

Are there corrupt files lurking inside your computer just waiting to cause harmful destruction?

How would you know?

Don’t let the peaceful operation of your PC (maybe it’s not that peaceful!) give you a false sense of security — you’d be simply astonished at the number of unnecessary files cluttering up and bogging down your computer right this instant!

Not sure why this caught my eye-but it did.  I go for long periods of time feeling “safe” and then this comes along and rocks my little computer world.  Which software is the best?  Your thoughts.