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You should be able to increase the video memory in the BIOS; your computer manufacturer configures that option in the BIOS and is most likely enabled by default.
Have you contacted your system manufacturer to check in your BIOS this option?
Also here is a link that can help you with this issue:
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.