Did you try reinstalling windows with just the hdd it will be installed on connected? Sounds like windows thinks it needs something off that other drive and maybe a reinstall would fix.
You don't have to do the ram. I have no temp issues just using a cheap zalman aio on my kids pc for the cpu only, and a blower style gpu (670ftw). Running g.skill 2133 ram in a vengeance c70. I am currently only running the two front intake with a b...