Windows 7 Display Changed

Hello,

I work in a school and one of the pupils has done something to change the appearance of the display/changed the icon sizes. I have tried zooming out and quitting the zoom function, i have checked that the resolution is correct and i have tried pressing the Windows +/- keys all to no avail. I have also tried the pressing ctrl and scrolling the mouse wheel, again this does not help.

The desktop background is normal which might give a clue to the issue, i don't know. The main problem i have is that due to the size of the windows and icons it is not possible to navigate the explorer windows. Any idea of how to fix this? I took a screen grab of the desktop as it is-please see attachment.

Thanks in advance.

He changed the screen resolution. Control panel, Display, Adjust Resolution, Raise it up to the Recommended setting.

Sorted it out. Turns out it was to do with DPI Scaling and they had scaled it up so large that i couldn't access the options. I downloaded a dpiscaling default file and merged that which solved the problem. Thanks for your time!