Samson,
try tomorrow, once in awhile it seems the servers for the free stuff gets overtaxed (like today my auto updates aren't current to the hour, which fits with your trouble).
As for the comment about AVG locking up computer, I can say the same thing about McAfee and Norton. All depends, as the saying goes.
I use AVG on 3 home computers, and 12 computers in the office of a non-profit I do volunteer work for. All just sing along happily.