For your own edification, I don't have an MD atm so I cannot confirm this, but what I remember from diddling around a long time ago with the moon units, was that I was never in the directory I thought I was in, or where things should go. I often was executing things on the server instead of the MD as well.
find / -name 'NVIDIA*.run'
You can see if it is lurking somewhere. As memory serves, and I drink a lot, wget was not dropping to the moon dir structure.
What I ended up doing, as memory serves, was DL the file to a thumb drive, open KDE on the MD and dragged it to the desktop, drop to a shell, kill x, and sh from there... I was new to linux, and could not mount anything vista formatted so I fell back on dummy tools to partition in linux.
Just found a PCIe x1 ION card for 60 bucks I plan on playing with once we are eating regular again.http://www.newegg.com/Product/Product.aspx?Item=N82E16814500164