Thanks a bunch, everyone here is so helpful! I spend three whole days and nights to learn how to use RunOnceEx, and now I come to know of another tool! Well I may not have that much free time in the coming few days, so let's try to work with what I have learned so far - let's go the RunOnceEx way rather than WPI way. While browsing through these forums, I came across a tool called "Autoit" - I think it may be used to close the window when Dropbox tries to launch itself. I'm still trying to know what Autoit is, and what it can do for me. In the meanwhile, can someone make a little script that will close the active window that has "dropbox" in its title? Also where to place this script on the Unattended CD? Edit: Nevermind, I downloaded Autohotkey, and "recorded" the install using the "script recorder" that came with it. Works like a charm!!!