It might just be AVG at their end with a bad update. Simply wait and try again in a couple of days. If the missing .bin file *is* down to AVG's update, reinstalling won't cure it.
Possibly downloading & installing the manual update file from AVG http://free.avg.com/ww.download-update might get round it.
If I'm wrong & the missing .bin file is not caused by AVG update, Chris F's reload is probably the way to go.
Passerby, August 2008