You might notice that when you enter the numbers, you also have to click "Set" and then "Apply"
There was one time when I adjusted the settings, and couldent figure out why it wouldn't change.
If the paging file is too low, Windows will re-adjust the size and make it bigger. I don't know how this applys to running out of disk space.
One thing to ask yourself is:
Do I really need to change the paging file size?
How much HDD space do you have free? Is it enough?
You might also try setting the initial size to something like... 1500 and the max to 1534. I had some problems once when I tried to set the max and initial size to the same, it just didnt work on my end.