IIS is the web/ftp server that's part of windows nt/2000/xp. If you don't need it you should disable it so someone doesn't hack you and run worms off your machine.

Microsoft Corp.’s Internet Information Server (IIS) has been trending upward like a fine wine: It’s getting better with age. IIS 4 was a disaster, and IIS 5 was essentially an open door if used on a ...

HI I suggest Apache Logs Viewer. Although the name says apache it can even open IIS logs or W3C logs as how they are known. This free program also can do analysis and filter of logs based on some ...