Did ya try another scanner? There are several online scanners available, including
http://housecall.trendmicro.com/ which is decent.
Also are you sure that the antivirus is actually crapping out on that file, or is just taking it forever to scan that file.
For fun post the full name (including extension), location, and size of the file. Also you could try opening it in notepad, if it is really a log file then it would probably be human readable, it would also be safe to just delete most likely assuming it is legitimate.