Nvidia RAID error, Is it safe?

I have recently been getting a popup message telling me that the Nvidia RAID has “encountered a critical error”, than the computer will freeze. After restarting several times it will work for about 4 hours and then it will freeze. I do not have much experience with RAID errors, and I don’t know how to compare them to hard disk errors.
What should I do? Is it safe to keep using the computer? Should I immediately turn it off and take it in to the shop? What would you recommend?

(RAID 0, Western Digital 150GB 10k RPM 2x, Vista SP1, Nvidia 780i)