High CPU Utilization

I've installed Windows 7 RC as an upgrade from Vista Ultimate.
With Vista Ultimate, my laptop (Lenovo T61) ran perfectly. Now, however, I see my CPU utilization (I have the Gadget on my Desktop which shows the utilization) sits on about 50-60% permanantly.
My battery life is now less than an hour whereas I was getting at least 3 hours previously under Vista.

I've tried uninstalling my Antivirus (NOD32) and some of the Lenovo SW I wasn't using, but to no avail.

As I said, I have a Lenovo T61 Laptop with a Core 2 Duo T7300 2.00Ghz Processor & 2Gig memory.

Any help would be appreciated.

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