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This is your processor:
Your graphics are known as "Intel HD Graphics", and support is limited if you are Windows 10.
Scroll down to "Celeron Processor with Intel HD Graphics, look at Windows 10 support and see the footnote #5.
If you are not WIndows 10, the click on
Intel® Celeron® Processor 2955U (2M Cache, 1.40 GHz) Product Specifications , select downloads and software, and find the latest driver there for your OS.
Leave the memory alone. The driver will automatically allocate up to half of your physical memory, if I am not mistaken.
No, you cannot change the graphics as it is incorporated into the processor.
Well, you should get it from ACER as they may have made customizations to the generic intel driver.
However, if you insist, you should be able to manually install it. Although for Windows 7, they should get you through the process:
Be careful, and have a restore point to fall back on if things go bad.