Try setting it to 150 or something around there to keep the games that like VRAM happy, but your computer functioning well. Also listen to TheMajor's advice about giving your hard RAM priority.
I don't personally like the way Windows manages pagefiles. I find that it puts far too much weight on it...and leaves some actual RAM unused. It should basically fill up the hardware RAM, and then when that runs out, it should move on to using a Pagefile. Just adding to the already huge list of why Windows sucks