You're welcome, but no, the Realtek update isn't going to fix faulty RAM. It's simply good practice.
There is a very slight chance that the PowerISO update fixed things, but it is leaning towards faulty RAM very much due to the fact that you've had a FAT file system error.
You don't even have a FAT volume on the PC, which means RAM simply bugged out, instead...and is defective because it is already set well in the bios.
Contact GEIL asap so any warranties do not run out. Show them this thread.