The very first thing you must do is download and install the Windows Performance Tools Kit (x86 for 32bit, x64 package for 64bit) - choose the "complete" option during install.

Next, open a command prompt, and type the proper command for the trace you'd like to execute:

For boot tracing:
CODE
xbootmgr -trace boot -noPrepReboot -traceFlags BASE+CSWITCH+DRIVERS+POWER -resultPath C:\TEMP


For shutdown tracing:
CODE
xbootmgr -trace shutdown -noPrepReboot -traceFlags BASE+CSWITCH+DRIVERS+POWER -resultPath C:\TEMP


For Standby+Resume:
CODE
xbootmgr -trace standby -traceFlags BASE+CSWITCH+DRIVERS+POWER -resultPath C:\TEMP


For Hibernate+Resume:
CODE
xbootmgr -trace hibernate -traceFlags BASE+CSWITCH+DRIVERS+POWER -resultPath C:\TEMP

replace C:\TEMP with any temp directory on your machine as necessary to store the output files


All of these will shutdown, hibernate, or standby your box, and then reboot to finish tracing. Once Vista does reboot, log back in as necessary and once the countdown timer finishes, you should now have some tracing files in C:\TEMP. If asked, upload or provide the file(s) generated in C:\TEMP (or the directory you chose) on a download share for analysis.