Our abysmal download success rates

As you can see from the graph below, our download rates for our DVD ISO are abysmal. Only about 22% of all users who start downloading the ISO complete the download. We gotta do better about this. Interestingly, we don't get a lot of complaints about this. but this has got to be a huge problem. We need to fix this. Do you have suggestions on how we should do this?

Here are cumulative numbers:

Download URI Attempt Completed % Completed Not Completed % Not Completed
/download/8/1/c/81c912c1-893b-4603-8c40-bf128444a932/6.0.5308.0.9.windowssdk_vista_idw.dvd.rel.img 35,310 7,720 21.86% 27,590 78.14%

and here are the breakdowns by day:

Feb CTP ISO success ISO failure % success
2/22/2006 Wed 770 470 0.38
2/23/2006 Thu 1170 13220 0.08
2/24/2006 Fri 620 420 0.60
2/25/2006 Sat 410 500 0.45
2/26/2006 Sun 370 450 0.45
2/27/2006 Mon 520 440 0.54
2/28/2006 Tue 590 530 0.53
3/1/2006 Wed 520 640 0.45
3/2/2006 Thu 520 2870 0.15
3/3/2006 Fri 450 1590 0.22
3/4/2006 Sat 280 4520 0.06
3/5/2006 Sun 240 270 0.40
3/6/2006 Mon 360 700 0.34
3/7/2006 Tue 280 210 0.57
3/8/2006 Wed 280 420 0.40
3/9/2006 Thu 280 340 0.45
TOTAL 7660 27590 0.22

Frankly, the numbers on Feb. 23rd are a real embarassment, and we need to get better in finding out why the downloads fail, and what we can do to make this better.