Seeing reports that Process Explorer 1.0 on some machines is eating up the CPU process. For a workaround, some are reporting to open the task manager firs, then ProcMon.
But watch the EULA http://www.microsoft.com/technet/sysinternals/information/licensingfaq.mspx
Q: May I freely load or use Sysinternals utilities on computers that I support but do not own?
A: No. You will need to contact Microsoft Sysinternals Licensing (firstname.lastname@example.org) and inquire about fee based licensing options.