From your logfile,I see that the updateinfo file is still not able to be downloaded,so could you please answer my question about whether you use the Spybot proxy or you don't use it?
The .upd at the very end probably means it's an update file,and this website shows that it is usually info about an update,though it could be a data file:
http://www.reviversoft.com/file-extensions/upd
Deleting it is unlikely to do anything,though I suppose weirder things have happened.Is bdcore.dll.upd located in the AV folder,where the bdcore.dll file is?
FraserR's logfile gave the appearance of having the latest bdcore.dll file,but then they still weren't getting antivirus updates,but then started getting updates again after renaming the bdcore.dll file and updating again,from their account,which is also something to keep in mind for you,but first,the reason your updateinfo isn't being retrieved really should be discussed.