Hi muziv!
I don't know what you mean with no results. Do you see Vienna Ensemble in the list of virtual instruments? When you activate Vienna Ensemble, is it possible to choose VE Special Edition as your sound set?
If not, please copy the sound set(s) to the following folder (as stated in the readme file),
Windows XP: Documents and Settings\your username\Application Data\Sibelius Software\Sibelius 5\Sounds
Windows Vista: Users\your username\AppData\Roaming\Sibelius Software\Sibelius 5\Sounds
Mac OS X: Users/your username/Library/Application Support/Sibelius Software/Sibelius 5/Sounds
You may have to create the "Sounds" folder if it’s not there. (Don't copy it straight to the Sibelius 5 folder as you have written).
Best,
Andi
Vienna Symphonic Library