If want to analyze your logs using awstats setup awstats like it’s specified here: http://awstats.sourceforge.net/docs/awstats_setup.html

Special for IIS is the log format, dumb log format.
Change your settings like this:
#Logformat for IIS is 2
LogFormat=2
LogFormat = “%time2 %other %other %method %url %port %other %host %ua %code %bytesd %other”

Just say thanks.