I am sorry to hear you are having problems with your system but let me help you.
The processor you have is a processor based on Haswell platform with Intel® HD Graphics meaning that the driver you should install is the newest one. Here you have the download link:
Thanks for pointing this out. I have corrected the list to include G1820.
@ aljoedfro, The Celeron G1820 has 10 EU's. Here are a couple sources of information for the Celeron G1820
3rd Party sites
thanks a million!