This may help a newbie to file uploads.. it took advice from a friend to fix it..
If you are using
If you keep getting permission errors on file uploads... and you have sworn you set the permissions to write to the directory in iis...
double check that
a) in windows explorer under tools > folder options
click the view tab
scroll down all the way to "use simple file sharing (recommended)"
uncheck this box
b) find the folder you wish to upload to on your server
c) click properties and then the security tab
d) make sure the appropriate write settings are checked.
you may want to test by setting "everyone" to have full permission....
BEWARE doing this will open up big security holes on your server....
hope this helps