Can't take all the credit, VelvetStrokes beat me by a whole two hours, but put it in this forum. I thought it worthy of wider attention, hence R&N.
A number of people have talked about "lost" files. As someone heavily involved in this area, I cannot overstate the importance of taking regular copies of your critical files.
There are various ways of doing this, dependant upon your technology, so I won't specify any particular product. However, it is good practice to take copies at regular intervals. I set parameters to take a backup of a file whlst I am editing it, but of course this probably would not protect you if you were "infected". At least once a week I copy to an external backup device. These files may be restored once you are absolutely sure your machine has been disinfected.
Will try and post more when I have more time, funnily enough I am in great demand today!