If I remember correctly for most vendor-locked graphics chipsets like that you can extract both sets of drivers, and modify the inf file from the intel one to contain the hardware id from the fujitsu one, to allow you to install the intel one on the fujitsu-locked hardware
I don't remember the exact instructions, unfortunately. This is the instructions for a vendor-locked nvidia laptop gpu, the procedure for intel should be similar:
http://forum.notebookreview.com/threads/installing-675m-and-its-driver-on-clevo-p150hm-sager-8150m.689544/
Windows 7?
go to the control panel.
open system applet.
go to device manager
right click on the display device
choose properties
select the hardware IDs tab
in the dropdown, choose "compatible ids"
right click on (usually) the second or third one in the list, and choose copy.
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open the INF file for the intel graphics drivers.
find the section that contains all the lines like this:
PCI\VEN_8086&DEV_2105; (made up example.)
paste the compatible ID for your display device into the list, and decorate it so it matches the form of the others in the list.
save the file.
install the driver.
windows bitches about the driver not being signed. (the alterations of the inf file has broken the signature check.)
install the driver anyway.
profit. (or fail. this is not guaranteed to work.)