In a command prompt:
Code:
wmic PRODUCT list full /format:htable >"%userprofile%\My Documents\0.html"
That should allow you to determine the Installation ID. Just open the 0.html file after it is created. You can of course name it something other than 0.html; that is just an example.
Make sure to run the command with administrative privileges by either running as an administrator or using the
run as command in XP if this is in Windows XP.