If you have a windows share with a space character in it's name, e.g. something like
\\server\my share, to properly mount it from
/etc/fstab you need to use the octal code instead of a space character. Otherwise parsing
/etc/fstab would produce an error, because space character is a delimiter.
The octal code for space character is \040 (don't forget the leading zero!), so you'd put
//server/my\040share in the
/etc/fstab for the example above.
If you have any other special character in a windows share name, you can use the same technique. Just use the appropriate octal code, of course.