Stephan Schreiber from Berlin, Germany had developed a driver for Windows NT4, 2000, XP and Vista and the server editions that allows Windows to acces Ext2 and Ext3 filesystems. Read about it here. This driver is only for Ext2 and Ext3 filesystems with an 128 Kb inode.
Modern filesystems usually use 256Kb inodes.
Fot these systems you should use the driver bij sysinternals:
Look for it here.