Several programs running at a time during the startup of your PC might result in Windows 7 slow startup issue. Thus you need to remove unused programs from the startup list of your system. The speed of the booting time of your system would definitely increase by the removal of such unwanted programs.
I have already mentioned that i disabled all the startup programs and services.If you really want to help me then listen:
When I enter password welcome screen appears for 10 sec, then a black screen for 7-9 sec, then task-bar appears,than wallpaper,and after 15-20 seconds desktop icons and gadgets appear.During this time and after 2-3 minutes, I cannot use my PC because it doesn't response.