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btw, that's right, however, Guest accounts don't use to have the needed rights to execute msgplus.exe so for all guest account you have to install plus.
No, no, no !!! Not necessary !!!
You just have to grant the "restricted users" the rights to read/execute the files located in the "Program Files/Messenger Plus" directory and that's all. (I've checked, it's perfectly working on my XP).
By default, only Administrators and Power users have the right to read/execute/modify everything that is located in the Program Files folder. Restricted users and guests accounts can only read/execute these files.
For some reasons, the files installed by Messenger Plus! are not readable and executable by the restricted users/guest users (I don't know if the power users are granted these rights, but I'm sure that the admistrators are).
The only thing you have to change is the way the Messenger plus! installation process create its files. It has to grant every users the rights to read/execute Messenger plus! files. (actually you shouldn't have to worry about granting the correct rights because by default, when you create a file, it is granted the same right as the parent folder, in this case "Program Files". And this latter grants every users the "read/execute" permission).
This way, every user, including the guests, will be able to run Messenger Plus!
So there is absolutely no need to install Messenger Plus in every guest account !!!!!