Check out the hijackthis tutorial here .
http://www.spywareinfo.com/~merijn/htlogtutorial.html
You could also use this EXE file search to get a driscription of the exe's in startup to see if they are good and if they are needed .here is one=
http://www.kephyr.com/filedb/index.php
or download and use this one .
http://www.pacs-portal.co.uk/startup_pages/start_ups.exe