It's basically just running so slowly - it freezes and the mouse won't move and then it unfreezes again: this is constant. Typing is the same - I can be typing and then it just stops putting the letters on the screen and if I keep typing, it doesn't catch up on the words I've input. The clock is now at least 2hrs slow. Everything takes so long to do - opening up a web page is a nightmare, but even saved documents are slow.
How do I know if it's a virus? And if so, how do I fix it???