Not really a linux question
AFAIK you still only have read-only support on ext3/2 partitions in windoze, but look for a program called Explore2fs There's like 2 or 3 others, but IIRC this is the one that seemed to work best, and was most updated (of course, this was quite a while ago...)
Other options, which might work better would be something like cygwin (google.com for cygwin)
Cool