System time and cpu usage

I'm having an issue across multiple, freshly-imaged win7 x86 machines. We're seeing 45% cpu usage at idle and the machine is actually counting time slower than normal. For example, if the machine is rebooted at 3:00 (time set by network) at 3:15 it might say the time is 3:05. As time goes on the difference between actual time and system time increases.

Anything that increments by seconds is thrown off, for example the graphs in task manager increment in sync with the system time.

Here's where it gets weird and I swear I'm not making this up, but moving the mouse cursor actually helps alleviate the issue. So if I'm watching the cpu usage graph in task manager and I move the cursor around the graph will move closer to real time.

I've never seen anything like this in my years of IT, anyone have a clue what's going on here?