Svchost.exe Putting Out Very High CPU Usage In Services Power?

I have a system I am working on that no matter what I do svchost.exe keeps CPU usage on a Quad core hovering around 70-80% and temps in excess of 120F with a ThermalTake BlueOrd cooler installed. It is a custom system I built, with the following specs:

Tech Support Guy System Info Utility version 1.0.0.1
OS Version: Microsoft Windows 7 Professional , 64 bit
Processor: AMD Phenom(tm) 9850 Quad-Core Processor, AMD64 Family 16 Model 2 Stepping 3
Processor Count: 4
RAM: 1791 Mb
Graphics Card: ATI Radeon HD 4200, 256 Mb
Hard Drives: C: Total - 305142 MB, Free - 265597 MB;
Motherboard: ASUSTeK Computer INC., M4A785-M, Rev X.0x, 105424870002755
Antivirus: Microsoft Security Essentials, Updated and Enabled

Usage spikes when Outlook, IE8 and SKype are running after a random time period. I had this system on my bench for 2 weeks straight running benchmark tests and stress test software which all came back "PASS." I scanned for malware, virus, rootkits, etc. to no avail (all clean). Because of the extraordinarily high usage, USB drives are not working properly (take more than 2 hours to come up) and the system is sluggish. This should not be happening on a QuadCore system with a high-performance cooler. I even went so far as to format the HDD and perform a fresh install of everything. It worked perfectly for about 30-min then the BluRay drive stopped recognizing discs, CPU usage spiked up to 70%+ (two cores are at 94-97% usage all the time), and it won't pick up USB devices.

HiJackThis log:

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 2:32:41 PM, on 1/21/2011
Platform: Windows 7 (WinNT 6.00.3504)
MSIE: Internet Explorer v8.00 (8.00.7600.16700)
Boot mode: Normal

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