Americas Corvette.com had been badly hacked 3 times and a serious virus once that host-gator had to clean up for me. Since installing word fence a year ago it has locked out a lot of intruders in all 5 web sites and I haven't had any other real problems since.
Word Fence is the Life Lock of web site safely and I highly recommend installing it. Word fence looks for problems you may miss and assists in correcting them. What else could you ask for in web site security?