You need to have
updated Anti Virus Software on your machine. If your Anti-Virus
definitions are more than a day old, they are outdated and
need to be updated.
You should always
maintain backups of your work. In the event that the media
holding your data fails, you will need to rely on your backups
to recover your work.
Don't think that
the media holding your data won't fail. It will. Change
your thinking from 'If it fails...' to 'When it fails...'