This is your processor: Intel® Pentium® Processor B970 (2M Cache, 2.30 GHz) Specifications
Your Intel HD Graphics are supported on W8.1 according to this link: Supported Operating Systems for Intel® Graphics Products
I cannot find any W8.1 drivers under that link: Intel® HD Graphics for Previous Generation Intel® Processors
However, the drivers (184.108.40.20629) here for W8.1 should work: Downloads for Graphics for 2nd Generation Intel® Processors
And, this was already answered in your previous thread: I have Pentium B970 any good drivers for it?