My first suggestion...do not look at the overall list, focus on the Logon tab
(where typical startup items are). The overall list generated includes Windows files, drivers, etc...anything that begins at startup.
If you come across items that you are uncertain about what programs they are associated with...use Google to look it up. The reason I prefer Google to some listing of startups...the proliferation of malware that copies the names of legitimate files. A given filename means little today...unless it is viewed in context with typical file size and expected location/path for said file. That info may be reflected in the database of startups, but it will definitely be reflected if you use Google and look at a couple of entries about a given file that is ostensibly "a valid startup item."
You can also use Startup Programs Database - http://www.bleepingcomputer.com/startups/