UPDATE, I recently installed version 3.9.5 on my own Lenovo G560 laptop which has onboard Intel (R) HD graphics, ran WR AIO, hit the reboot in Safe Mode button within the program, then ran WR after rebooting into Safe Mode and got the same distorted display I saw on my friend's machine . If I minimise the window and then restore the window by clicking on the minimised button, the program window displays correctly. If I close WR AIO and restart, the window is again constricted, while minimising and restoring displays it correctly! The error occurs whatever the display resolution in safe mode.
You may be able to see on the first constricted program window that there are is at least one, possibly two, unreadable message windows behind the program window. I believe one may display "An error occurred while trying to delete the specified data element" but no more was visible - I saw this partially hidden text once when I was trying to replicate the problem. Whether or not this is relevant, I don't know
No big deal, as I can now get the correct display with a couple of mouse clicks, but something odd seems to be going on.........