I assume you're not using this RAID array for your OS, so the steps you need to take are as follows, Apologies if all this seems obvious/patronising to you, I'm don't know how much you know or have already tried:
1) Make sure you have the necessary SATA RAID drivers installed for the H77 chipset, otherwise windows may bluescreen when it tries to boot after a SATA mode change.
2) In the BIOS, ensure the SATA mode is set to RAID, or RAID/AHCI. The H77 RAID functions won't be enabled if you have AHCI or IDE mode set here.
3) On exiting the BIOS, keep an eye out for the RAID configuration screen before you see windows start to load (It varies from board to board, but there's normally a prompt to press somthing like CTRL+R or CTRL+I).
4) From there, see what it says about your RAID volume.
You are looking for "RAID member disks" in the RAID config screen:
If they're detected as foreign disks, you may need to import them.
If you see a degraded volume it means one of the disk isn't working properly (but you should still see the RAID in windows)
If you don't see any disks at all, try panicking!
Google is your friend, otherwise come back here and post what you've got.