Physically removing the nVidia card may be a good idea. For sure you will
save energy, but I even think you will gain performances for some things
(like video decoding). Just burn and boot either:
a live CD/DVD https://trisquel.info/en/wiki/burn-trisquel-cd-images
a live USB: https://trisquel.info/en/wiki/how-create-liveusb
If you like Trisquel and want to install it alongside Windows (for a start),
make some space on the disk, defrag Windows and follow these instructions:
https://trisquel.info/en/wiki/install-trisquel-windows-dual-boot-0
