For the title, you can PM me with topic link and the new name you want it to be.
About the SFX, if an app won't protest then that's my preferred way because of compression, and many other reasons. (sadly msoffice wants a crapload in the registry made by its installer)
Now for your problem, one thing I can say for sure is that no app I install at T-12 (cmdlines.txt) shows up any explorer windows (even the installers that normally throw up an explorer window with start menu shortcuts don't dare do it!). This could be because explorer.exe simply can't be started at that stage becvause of DLLs or whatever....
If that is not a solution, and your app installs are done at GUIrunOnce (that's when explorer.exe is NOT running), then you could just use
taskkill /F /IM explorer.exe
In XP home, taskkill is not available so you can download pskill from sysinternals.com
pskill explorer.exe
Hoping this helps....
Do post back on what you finally decided to do.