You asked where AC was installing. The answer is C:\Program Files (x86)\Amazing Charts\.
In the interim, we replaced the problem computer with another, new, Win7 64Bit Home Premium computer. The problems continue.
I checked Event Viewer. Our poor MA endured crashes every 45 minutes to an hour on this machine. Here is what it reported for all but one crash:
Faulting application name: Amazing Charts.exe, version: 5.0.0.29, time stamp: 0x4c16f684
Faulting module name: mfc90u.dll_unloaded, version: 0.0.0.0, time stamp: 0x488f1605
Exception code: 0xc0000005
The one exception was:
Faulting application name: Amazing Charts.exe, version: 5.0.0.29, time stamp: 0x4c16f684
Faulting module name: PlusCore.dll_unloaded, version: 0.0.0.0, time stamp: 0x4a434010
Exception code: 0xc0000005
We have one other Win7 64 bit machine in the office (the rest are Vista or XP). It has never hiccuped.
Tried having Windows run it in "compatability mode" (Windows detected it as a Vista Service pack 2 compatible program.) No luck.
We've "repaired" AC, uninstalled/reinstalled. No luck.
Stumped.