>When I try to uninstall VFP7.1, after the upgrade to XPSP2, I get only a terse message like "This product cannot be uninstalled." (Most of my machines have 7, 8, and 9 on them.) I didn't think much of it at first, but now it's causing different results in VFP8 & 9 testing, if the VFP7 runtimes are still existing...
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>That is, I want at least one clean machine with VFP8.1 ONLY for isolated testing. No VFP7, no VFP9.
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>I know a crude technique for removal (delete all the files, and then clean the registry), but anyone know any easier/better ideas to get past that VFP7 uninstall blockage by XPSP2?

You can try to run VFP7 install from CD to see if it offers Remove All options. If it doesn't, try to run the same install in the Repair mode and then try to uninstall VFP7.