Mid 2011 iMac 27 Loud Fan in Windows Only (HDD Replaced)

I bought a 27" iMac (Mid 2011) without a HDD online. Installed a spare 250GB I had laying around and I've been using it for a couple days, no issues. Today I installed Windows 7 x64 and noticed the fans are going crazy. I installed all the drivers and the computer was still pretty loud. I rebooted into Lion and it was fine.
I read online that the hard drive needs to be a genuine Apple hard drive for the temperature sensor to work. Is this true on this model? Also why is it only happening on Windows and not Lion?
Computers under warranty till 2014. Unfortunatly, I can't do anything without the original HDD. I'm trying to contact the guy to see if I can locate it but I haven't gotten a response yet.

Sorry to hear about your experience(s) - I'd suggest calling Apple and relating your experience; not all Apple stores actually do the work themselves. In my area, they actually have a contract with a third party service provider who does the actual work, so that could be the same thing with yours. In either case, it's not a really good track record, so I'd try calling Apple.

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