Refer to this site for some information. http://www.bgsu.edu/offices/its/tsc/pdf/virus.pdf
If you want to just protect your documents, a macro virus is the best bet which could wipe out your HD. What u could do is to go download one, then put it in a macro. Also, refer to this site in case u need help to protect yourself againts one: http://www.bris.ac.uk/is/services/co...s/log_bomb.htm