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It looks like those NavRoc computers are just "ruggedized" miniPCs running WindowsXP. And if that's the case, and the computers are just crap, the simplest solution for you would be to buy a couple of better-built laptops that already run WindowsXP and reinstall the software to the new computers--instead of moving to a different platform and having to buy all new software all over again.
I'd suggest looking at some Panasonic Toughbook computers, probably the best bet in a "rugged" PC without getting into the odd niche-market machines like the NavRoc.
If your computers are unstable because they are not well made, you can't blame that on PC/vs/Mac. And if the applications are unstable and crashing the computer, again, you can't blame that on the OS, they could be equally unstable on a Mac.
If you've just got bad hardware, replace it with good hardware. Don't throw the baby out with the bathwater.