If your computer is slow, or crashes frequently, you may suspect a virus. But how can you be sure? Accurate diagnosis can be tricky, so let's run through major symptoms, minor clues, and a few surefire ways to tell.

Ughhhh! If your PC has ever been infected - or worse, if it's infected right now - you're probably groaning. Yes it's a pain, but the good news is: you can remove viruses yourself, for free.

You bought an expensive smartphone, and you don't want it to get scratched up in your purse or pocket. But do you need to add a screen protector? And can these thin pieces of plastic really help prevent cracks when you drop your phone?