1. Run the "Y! Vista Blue.msi" file from the pack and it'll install the skin. 2. Run Yahoo! Messenger and change the skin from "Messenger -> Change Skin... -> Y! Vista Blue by Vishal Gupta".
I hope you all will like this skin as you liked all my previous work. Please give your valuable feedbacks.
Please don't release/distribute modified versions of my theme without getting my permission.