It should only be necessary to open Intel® Rapid Storage Technology software, click the Accelerate tab, click Stop Acceleration, and click Reset to available.
Chipset Software — Intel® Smart Response Technology User Guide
It is expected to get a Blue Screen of Death when you change the SATA controller from RAID to IDE or vice versa, because the operating system was installed in that mode. You may need to reinstall the operating system if you really want to change the SATA controller mode in BIOS.
However, it is possible to delete a RAID volume connected to an Intel® Chipset by pressing CTRL + I during POST (before operating system starts booting) and select Reset Disks to non-RAID in the RAID BIOS or RAID option ROM. No data loss is expected but it is advised to create a backup.