Hi Nil0505,
Thank you for your feedback.
I did use the Intel Driver Update Utility which showed that there was a later driver for the display adapter .
However I discovered that that Intel driver could not be installed on Windows 10 ! It just "failed" without explanation (I later discovered that it was W10 incompatible)
As I said I had to reload windows 7 to update driver and now all is working fine. A drastic solution I admit but I must say I'm much happier with Windows 7 anyway.