The instructions at this link should help:
Tips > MSCONFIG
Blank entry in MSCONFIG
Author's note: The following was extracted from a SpywareInfo forum post that is attributed to Paul Collins, who created and maintains Pacman's Portal. Portions of the post have been omitted.
If you have a blank entry in MSCONFIG it is likely to be as a result of one of two things:
1. A program install/uninstall has not completed properly and therefore not updated the registry "Run" keys. Looking at these registry keys may in some cases reveal an entry with a Name but no Data, others may have neither:
Check these keys and see if there's an entry under Name and it may give a clue. As no program isn't being loaded in the Data column then the registry entry can safely be deleted. Author's second note: Back up the registry before making any changes. Also, in XP
I looked at the startup tab in msconfig. There is a checkbox checked with a blank line following it. What would that be about? This entry is in the middle of the pack. All other checkboxes have a line following to tell me what is starting up.
XP home 2.4 GHz 512 MB RAM