Server/Network Downtime Tracking

I’m looking for a utility or program, that will assist me in tracking down time for a server or the network.[date, time, names, places, actions, etc.] This was just a basic spreadsheet before, but now management wants reports and a better presentation.
if you use or know of something plese reply or drop me a note.
Thanks, Brian
Harrsiburg, PA
bklimes@excite.com