Maybe a Virtual PC issue?  I have this on about 5 physical devices and VMware Workstation without seeing this behavior.  I get a brief spike on launch but it soon goes down to around 0% 
To evaluate Windows Thin PC (WinTPC) as client OS to our 7.2 MR1 farm, I decided to install the release candidate in Virtual PC 2010.  When I launch an app from the vWorkspace web portal, all what happens is pntsc.exe getting launched and eating up my CPU. Installed Quest vWorkspace Web Connector for Windows first. Then AppPortal once the above problem emerged immediately.  It's connecting fine with my own Windows 7 Enterprise desktop, just not in my WinTPC virtual machine.  Already disabled UAC in WinTPC. Also tried launching apps from FireFox 4 and Chrome instead of the built-in IE8. Changed the IE security zone to lowest. All without any luck.  What workarounds or ideas can you suggest? Is it a missing component that got stripped in WinTPC, maybe a conflict with Virtual PC or something I'm overlooking?  Thanks for your help! Cheers, Mike
WinTPC not working yet (just high CPU)