Inaccurate CPU usage in processes list

I had to reload my counters with a command in order to get CPU readings at all. I got that working, but now the only accurate CPU reading is the CPU tab. If I open the processes tab, some processes say 0% and others don't even show up. Do I need to reinstall?

Windows 7 x64

intel core2 duo E8500

Mainboard MSI MS-7357

nVidia 470