X61 Tablet fan stopped running on in Windows 7 RC (I think)

[lowesox]

I had to get a new hard drive and battery, and instead of putting up $50 for a set of recovery disks, I just installed the latest RC of Windows 7. I'd used it on this machine in the past, and was quite happy with it. The one problem was that I needed bluetooth and the only fix I'd found to get Windows 7 to recognize the BT radio was to use TPFanControl, which it did. Nothing had been different, either, until today I noticed (because of TPFanControl actually) that I was getting extremely hot CPU temperatures. Like, 70-80 C, even hitting 88 (at which point I shut the computer down), and not under load. I've been playing around with it since and have yet to hear the fan go into overdrive like it always had to get that kind of heat under control. It's a hot day today, but I'm inside and it can't be more than 75 Fahrenheit in here (or, what, 25 Celsius?). But I'm doing nothing more than surfing the internet and it's getting into the 60s without trouble (I've used CPUcool, some other temperature monitor, to verify this).

Searching for a fix to this, I only seem to find people complaining about the fan making too much sound. I never had a problem with this, as I'd rather have a cooler and more stable machine. I've opened up the laptop, checked the fan, and it's not obstructed or anything. I'm not getting any fan errors like others have described when the fan isn't operating correctly (which has prevented others from even being able to start up evidently), and the monitors on TPFanControl tell me that it's spinning which I can hear, and I can feel ever so slightly, but I'm still not hearing or feeling that characteristic airplane sound that a cooling fan makes when things are getting too hot. Even when I set it to the maximum fan speed manually, it's telling me it's spinning around 4500 RPM (4800 is unstable, from what I read), I'm not hearing that loud, reassuring sound I want.

Is this how hot my laptop had always been running on hot days like this, 60-70 degrees Celsius? Was that loud sound actually a defect that TPFan has now fixed? Is it something particular to Win7 (and if so, why only now?). Finally, does anyone know how I might get back the old school jet engine when I need it?

[Utwig]

I'm running RTM (and before that RC) on X61t and I had no problem installing drivers for bluetooth, no need for TPfan control, just press Fn+F5 to turn BT on and it will install drivers. The fan is running normally.