Thanks to Neobond at Neowin.net for sending in this info and the proposed workaround!

I have found a problem in Windows XP in that right clicking on a file in Windows Explorer causes 100% CPU utilization on Windows XP. This only happens on files that have not been selected first with a left mouse click. This problem is reproducible on Pentium 3 and Pentium 4 machines of varying speed, does not happen on Pentium 2 systems.