Lost HTML in gmail and screen background has gone black

[Windows Central Question]

Like I say, the backgrounf colour of the start screen and icons has changed from blue to black and there seems no way of recovering that. More importantly gmail no longer displays URLs or the graphic content of emails.

Is the OS corrupted? If so, how do I recover?

 

[Maurizio Troso]

Like I say, the backgrounf colour of the start screen and icons has changed from blue to black and there seems no way of recovering that. More importantly gmail no longer displays URLs or the graphic content of emails.

Is the OS corrupted? If so, how do I recover?

Wich device and o.s. build please