A very important thing to ensure when downloading something like an audiobook is always make sure it's the genuine thing. Was the file size below 1000 KB? If so, it's spam and by the looks of it you were one of the unlucky ones who got a virus. The idiots who put viruses on the network often deliberately make sure it looks genuine, file size and all, so it sometimes cannot be prevented - it's just plain bad luck if you download it. Uninstall Limewire - it's incredibly unlikely it will work again now- and try, using My Computer, to locate the file as it has clearly stayed on your computer despite you having deleted the file. Get someone with a decent knowledge of computers to help you - there's a better chance that they'll recognise any trouble on your computer.

One last thing - if you often download audiobooks, getting Limewire firewalled may be a solution - I know it can be annoying but hopefully it will make sure this doesn't happen again.