One of my apps is created with Wise Installer, it'll automatically reboot and how do I surpress that?

There's no switch to surpress a reboot with wise installer. You have to make an autoit script in order to do it. Check out this thread for an example--> http://www.msfn.org/board/How-To-Outpost-Firewal-t29004.html

Found me different installer for same apps it's MSI. I'm having same issues I tried using the following switches

/noreboot
REBOOT=REALLYSUPPRESS
REBOOT=SUPPRESS

It still reboot Arghhh, any good apps that'll let me modify msi packages?

Did you try with /qn REBOOT=Suppress in this syntax with the app you are trying to install. I haven't had an app yet ignore the reboot command in an msi package. Anyway if you want to edit msi I recommend MaSaI Editor (its free).

Thanks, tried out MaSaI and it solved my problem! Found a string "force reboot" that's sooo nasty!