Now I get LU 9000

For months NAV06 virusdefs were eating up all my hard drive space and I couldn’t delete all these files.  Then, a few days ago, I was able to delete the files and got back 12Gs of space.  I tried to update my protection and now I get LU9000.  This seems like and endless loop.  I haven’t had protection (red X) since the end of January because I couldn’t download files since my hard drive didn’t have enough space due to what was taken up by all the virus defs.  I was thrilled to get back the space, but now I can’t complete a download.  Any ideas?