Originally Posted by AgentCash

find the text file where awstats stores it's info.
for example, mine is located in
/usr/local/awstats/wwwroot/cgi-bin/
and called awstats062005.domain.txt

open that file and search for
BEGIN_SIDER_404

there will be the urls that were 404 between it and
END_SIDER_404

delete them. Then search for
BEGIN_ERRORS

look for the line starting with 404 between it and
END_ERRORS

delete that line and rerun awstats... you may need to copy the .txt file over the .bak file as well, not sure haven't tested it.