Is your Vista machine running slow? Not responsive? Microsoft added "Reliability and Performance Monitor" with Vista. I was playing around with this tool and I realized it’s THE best tool to quickly analyze your computer.
I was amazed to see which programs or services are using the network, accessing disk, occupying memory in almost REAL time. WOW! You may find exactly what’s bothering your computer in minutes.
Here is how you use it.
1. Click Start (Orb) Button and type "performance"
2. Select Reliability and Performance Monitor
3. Play around and find that naughty program or service
Here is the screen shot of "Reliability and Performance Monitor" looks like,
Anand, the Architect 