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Firstly you can't access the data until the OS is up and running since it's software based, attaching the disks to another machine and then accessing the data is possible.
Plug the disks in, get into windows, open up disk management and right click and then rescan disks. That will then bring up the software RAID array.
However this is a terrible idea and windows software RAID isn't very good. It's slow, you can't access the array without windows (No chance of a disk scrape either) and RAID1 for data is pointless.
Does that answer your question better? :D
Regards
Alex