I was told that VFP8 would not work properly on NT 4.0 and
Win 98 1st Edition. I don't know if this has anything to do
with your problem or not.

>>Using the InstallShield Express that comes with VFP8 I have created an install package. With the first version of our app, I successfully installed on the Windows 98 machine as well as XP , 2000 and NT 4.0.
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>>Now we have different versions that we want to install and test before distribution. I have successfully uninstalled the old version and then went to install our new version (again built with ISE). Now we are receiving a VFP8r.dll is invalid or corrupt error message the moment we run the VFP executable.
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>>I have unistalled the application numerous times, removed all runtime files as well as gdiplus.dll on the 98 machine, and then reperformed the installation with the same result of an invalid or corrupt vfp8r.dll.
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>>I can run the VFP8 executable over the network and it runs fine (my machine is an XP Pro OS). I'm using the same runtime files that is being installed on the 98 machine. I have even tried a different installer (ASTRUM from thraex software - great program BTW) and had the same result.
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>>I have manually tried to register the dll's on the 98 machine but receive a "GetLastError" returns 0x0000001f error when I try and manually register.
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>>This is very frustrating in that the app was once installed on the 98 machine but now it will not happen. No problem on XP, 2000, or NT 4.0 machines (yes I have ensured that OS platforms has Windows 98 included on the build criteria).
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>>I figured I'd just try manually registering the appropriate files on the 98 machine to see if that would give me any idea as to what is happening. Anyone else have problems on a Windows 98 machine install?
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>Yes! just yesterday. I've successfully installed my Installsheild Express VFP8 build on XP systems, but yesterday attempting to install on a W98 system produced the "VFP8r.dll is invalid or corrupt" error message (useful message, huh?). Spent time searching for solutions, but don't feel confident that I've found anything. Was going to try to manually install gdiplus.dll today, but would love to hear other suggestions....good luck! J