Should I format my mac ???

I have had some problems like:
1) Some folders disappear and which are still impossible to find
2) Voice Over ( What time is it ?) since today has gone away and impossible to find even on the dock
3) I put aMule and it might given me some virus
4) I can't install some programs which I download for Mac and only Mac.
And do you know if I can put some free anti-virus for Mac????
And ps: Who can I format my mac osX

Johnathan, with a little bit of imagination, I guess he meant: How (and not who).
Now, Zago:
1) The folders that went missing: Have you changed the shortname of your account (the name of the home folder)? If so, that may explain what happened. Also, Have you tried looking with Spotlight for the files that are lost
2) The voice over utility can be turned on and off in the speech preferences pane of the System Preferences
3) There ARE NO viruses for Mac OS X
4) Which programs are you trying to install?, and How are you doing it? When you are novice to Mac OS X, the different way of installing things can be a little bit confusing
ClamXav is a free antivirus that works in the mac, but, as it has been mentioned before, it does not detect Mac Viruses, because THERE ARE NO mac viruses, it only detects Windows viruses.
Be careful about reading health books. You may die of a misprint.
Mark Twain

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