Updated Windows 10 - Microsoft Community

installed new update,  after  going through welcome start instead of going desktop,  all blank screen.  can help after  a  long time waiting desktop picture comes on task bar shows nothing , seems freeze not allowing me or uninstall update 

press control + alt + del on keyboard

click sign out

• hold down shift key on keyboard while clicking power button on screen.
• continue hold down shift key while clicking restart.
• continue hold down shift key until advanced recovery options menu appears.
• click troubleshoot
• click advanced options
• click startup settings
• click restart
• press (4) enable safe mode
• wait while windows 10 starts in safe mode.
• log in
• press windows key + x
• click device manager
• expand display adapter
• right click display adapter , click uninstall
• exit device manager
• if have older antivirus utility uninstall it.
• restart

you might need go working computer, download latest video driver computer, save thumbdrive. copy affected computer , install it. if there no native windows 10 driver, download latest windows 7 or windows 8.1 video driver , install in compatibility mode.

learn more:

how to: install , update drivers in windows 10

if none of above work, try rolling previous version , wait while upgrade again:

how to: rollback previous version of windows windows 10

Windows / Windows 10 / Install, upgrade, & activate / PC