Desktop

Hello,when the windows starts up the disk top is missing! i download the browseui.dll which is a system file then the error was gone but the desktop never came up and i restarted the pc several times but no use
i think the prob might be due earlier there was an update and when my pc was shutting down and installing the updates it restarted accidentally during downloading the updates and after that the desktop was missing
can u please give me an advice and the way to get the system files missing or to solve the problem??
I would be great and thankful for you please see the matter
bye bye