Hello everybody,
Could someone help me.

I must use the Zexy library but I don't manage how to do it...

I've put the folder containing the library in the folder lib of Pure Data.
Then, I put the name of the folder of the library in File > Startup then I put the path for the library in File > Path.

But, when I open Pure Data the message: zexy-2.1: can't load library appears and when I open the pop-up File > Path I notice the characters / of the path have been disappeared.

I precise you, I work on Windows XP and my version of Pd is 0.40-1

Thanks a lot!!!

Try installing the Pd-extended version (0.38). Version 0.40-1 is Miller Puckette's 'vanilla' version which does not include the externals.