now my module is not showing in the addon in this path that is C:\Users\bakhtawar\workspace\abc\openerp-7.0-20130916-231138\openerp\addons it is showing in this path
C:\Users\bakhtawar\workspace\abc\openerp-7.0-20130916-231138\build\lib\openerp\addons\Asset_Allocation. i think if it will show in that path so then i can install my custom module that is asset_allocation.
as stated below by Gustavo, make sure you have the right permission. and make installation true in __openerp__.py