The second scan after the reboot. ZSoft supports a before and after reboot scan.
It's also a good idea to launch and close down a program first before doing the "after" scan, as extra keys can be added to the registry when a program runs.
EDIT: Although I was sure about this, I just thought I'd confirm it from the ZSoft Forums.
QUOTE
When analyzing something with ZSoft Uninstaller you do it in two parts: Before and after the installation. When you have done the first scan you can click cancel, close the program, reboot your computer etc., and come back to finish the installation by selecting "Finish an analysis that has already been started" from the "Analyze Installation" window.
http://forum.zsoft.dk/index.php/topic,92.msg408.html#msg408