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Thanks for joining the community.
I see you are connecting second monitor via DP to VGA cable and you are only getting 1024*768 screen resolution.
Please bear in mind some resolutions are not available for certain connection types. The connector you are using can also dictate the resolutions that work with your devices.
In order for all supported resolutions to be available, the monitor drivers need to be loaded, to check this, go to "Device Manager" and click on "Monitors". If it states "Plug and Play Monitor", then the drivers are not installed. In that case, contact the monitor manufacturer in order to obtain the .INF file to install the driver. Once you have the .INF, right-click on "Plug and Play Monitor", choose "Update Driver", and refer to the monitor's .INF file.
For additional information about video cable adapters, visit: http://www.intel.com/support/graphics/sb/CS-033418.htm
Thanks for the reply. I tested the DP to VGA adapter on another computer and it delivered correct resolution 1920x1080. Maybe the actual computer does not support the current adapter. Do you know any DP adapter compatible with this computer (Intel® QM57 Express Chipset, Intel(R) Core(TM) i7 CPU M 620 @ 2.67GHz, Intel(R) HD Graphics, Windows XP Professional Version 2002 Service Pack 3. ver 5.1.2600)?