If you have a Promise controller on the motherboard, I'd suggest going with what worked for me, which is a Promise PCI RAID controller instead of the USB enclosure... just install it in your new system but have it boot off of another hard-drive with your Windows install & you should be able to access the array again & back up your data to the boot drive, or you could try and get ahold of either another A7V333 which would allow you to use the onboard Promise chip.
You could go ahead & try the USB RAID enclosure & it may work, however all of the decent ones are very expensive & I've never tried it myself.... again I'd say your best bet is the add-in Promise card which can be purchased for approx $75 & is very likely to work in my experience as long as the HD's aren't corrupted or damaged.