windows 2008 KB2545850 not there in windows fixlet , is it something i can get old patches in the windows patching site or need to create a custom fixlet as software package?
This particular KB is a HotFix. Fixlets for these can be created by request (please open a PMR), or you can certainly create a custom Fixlet to deploy this (the Windows Software Distribution Wizard, or Software Distribution Dashboard could assist with this too). For more information, please see Patching Microsoft Windows Hotfixes