>The thing is that I have these 3 runtime files installed on that pc via InnoSetup.

>Source: C:\Program Files\Common Files\Microsoft Shared\VFP\vfp8r.dll; DestDir: {cf}\Microsoft Shared\VFP; Flags: regserver sharedfile uninsneveruninstall restartreplace
>Source: C:\Program Files\Common Files\Microsoft Shared\VFP\vfp8t.dll; DestDir: {cf}\Microsoft Shared\VFP; Flags: sharedfile uninsneveruninstall restartreplace
>Source: C:\Program Files\Common Files\Microsoft Shared\VFP\vfp8renu.dll; DestDir: {cf}\Microsoft Shared\VFP; Flags: sharedfile uninsneveruninstall restartreplace

>I don't have these installed because I could not see a reason to.
>msvcr70.dll and gdiplus.dll . Would these make a difference in this case?

Yes, The msvcr70.dll and gdiplus.dll are required.