Filemon

Is your PC acting flaky? This tool can help you find out what's causing the problems. FileMon gives you a real-time view of every running program--and lets you know what it's doing. The tool records and timestamps the actions of each open application--say, opening other files or loading helper programs. Watch for a specific program's behavior just before a system freeze.

Note: This link takes you to the vendor's site, where you can download the latest version of the software.