My pc's got a(many!!!!!) problem regarding desktop, taskbar...

hie reader..
i currently have windows 10...
i dont know if this is a windows 10 problem but this problem drives me crazy..
when i start my pc everything comes well till the sign in page...
after that when i sign in the whole desktop turnhs black..(no task bar, no desktop, nothing!!!!!!!)
but when i pressed the task manager shortcut key and opened it it came...
and somehow i open a software's folder using it...
then i cant do nothing....
i can access internet (which i am doing now) bygoing to the web browser folder and launching it....but the taskbar and desktop dont come....
and after around 25 mins-30mins(seriously)waiting the taskbar apppears but some of apps icon doesnt appear but the destop appears...
but if i try to open start it doesnt appear and any other things such as setting window...
so guys i request all of u to help me as soon as u an