dell s2240L resolution

hi. i recently finished upgrading my desktop to win 10 from win7. Before upgrading(format), the resolution i could get with s2240L was maximized as 1920 * 1080

but after becoming win 10 user, the resolution went down to 1600*900 and i can't stand it. it's so blurry and unclear.

i think i've tried all things i could think of. i updated driver for the graphic card and downloaded dell display manager(installed, but it says this app can't communicate with dell monitor..) from here .

nothing helped inscreasing the resolution.  

my computer is customized one and

i use vga for on back of the monitor and dvi for the graphic connection part on the desktop using converter.

graphic card detail spec is attached as an image and if my memory is correct there's no need to install driver for dell monitor with win 10 then it should be maximized automatically......

it's kind of an urgent issue for me at the moment please reply/ask if further information is needed.