It isn't you, it's the operating system. Low-fat diets are like Microsoft products: they're everywhere, and they work well enough for some people, but for others, they're an epic fail. Over the past few days, to work around an issue that Microsoft has known about for years and years, I've had to manually resize dozens of images every time I opened a document. And I've spent the entire evening tonight figuring out why my computer was at a standstill. (It turned out the automatic updates feature in good ol' Microsoft has been running up my CPU usage to 100%, bloating it like five servings of fruits and vegetables and a bowl full of whole grains. Disabling it has brought it down to 15% and made my computer functional again. Unfortunately, it has to be enabled to even get manual updates.)
How is this like low-fat diets? If your body doesn't run well on glucose for whatever reason (GI problems as I have, wonky blood sugar, dental problems, a weight problem, hormonal issues, mental function issues, etc.), it can take everything you have just to get through the day if you're trying to do low-fat. Most people without those problems won't understand.
Like the theories behind low-fat diets (the cholesterol hypothesis, the diet-heart hypothesis, the sugar-bad-fiber-good hypothesis, the ever-changing Mediterranean diet with its French paradox, and so on), Microsoft is a moving target. Office 2010 took the tools people had used for 20 years and scattered them. Some of the tools are gone. (The quick access toolbar is fine until you have to work on someone else's computer.) Third-party vendors, like makers of extra-mild toothpaste and stomach remedies and diet pills and moisturizers, are there with software you can download to work around Microsoft's problems so you can get something done.
There has to be a better way. The paleo equivalent of modern-day software might be DOS, which I actually found easier to work with. Maybe my next computer will be a MAC; maybe I'll get a Google tablet. I'm not paying $90 for Windows 7. Microsoft may think it's untouchable because its products are entrenched. But not so long ago, people switched from manual systems to computers. They can switch from one system to another system as well--and in the interest of saving time, money and frustration, they may do so. Microsoft is being protected by the network effect (it's widely used and companies want to be compatible with one another); low-fat diets by authority (government regulations that some people are subject to and scare tactics from authority figures). But no moat is unassailable.