boooggy Hey m8 found out the error problem,I was trying to slipstream into WinXP SP3 source. I presume its not compatible with SP3 yet ? Well,if you Slipstream first with updates as per your instructions for WMP11 slipstreamer and then integrate SP3,it informs that some updates must be removed before integration of SP3,if select NO,then WMP 11 doesn't get installed,but if YES is selected to remove updates then WMP 11 gets installed but doesn't run and when try to open it asks for 'Validation' and returns with 'Validation failed,Pirated windows' Secondly.if slipstream WMP 11 first and integrate SP3,it doesn't gets installed at all. So I presume,its not compatible with SP3. Any suggestion ? Have a nice day !