I'm going to assume you know how to enter bios on startup and are confident enough to make the changes. Now depending on what mobo and bios you have it may vary slightly, but in most bios setups the graphics is under the "Peripherals" tab. Now there should be an enabled/disenabled for the processor graphics, make sure it's enabled. Then there should be an allocated memory for processor graphics, if this is set low then increase it, 256 or 512MB would be plenty. Then save and exit and hopefully your vram problem is fixed.