Only by an extensive education - formal or informal.

You aren't going to pick this up in a forum without weeks of interrogation, but a 
good assumption would be that everything in the Windows folder is needed. On a statistical 
basis this is very close to the truth.

There aren't any files that are only "fairly needed". When Windows needs them it 
needs them and it will hiccup without them.

The way you are going you are heading for a big disaster - there are many files which, 
if deleted, will prevent your PC from booting then you'll be unable to use it at 
all.

If its running fine I would put your own data in a distinct place (My Documents would 
be good) and forget about the rest unless you are tight on disk space.

BTW I have a fairly minimal XP installation on a laptop and in the Windows Folder 
it has 1,711 sub-folders and 17,608 files. You would need to work for Microsoft to 
know what they all are - many are undocumented as there is nothing a  user can usefully 
do with them.

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