I try to install a distribution (Archlinux) from diskimage (iso) from Windows 7 Home Premium (32 bit version).
After unpacks the iso and c:\unetbin is created I get an error Window, the title is:
C:\unetbin\emtxfile.exe
The message (in Hungarian - I use Hungarian locale) is:
"A file verziója nem kompatibilis a Windows verziójával. A számítógép rendszeradatai között tekintse meg, hogy a program x86 (32 bites) vagy x64 (64 bites) verziójára van-e szükség, majd lépjen kapcsolatba a szoftver gyártójával"
It is the most current version 4.19. I tried it with other distributions (ubuntu netinstall) and the message is the same. If I start the emtxfile.exe manually, the message is the same. I have an older unetbootin version (3.77), I tried, and the result is the same. It's strange because I used the version 3.77 earlier without problem. The windows 7 is fully updated (and of course is legal). I suspect that perhaps a windows update changed the windows in some way (because the older version is worked before).
I assume you're using the Hard Drive install mode? Your 32-bit Windows seems to be getting detected as 64-bit, since something is going wrong when bcdedit is called. Would you mind opening a command line, with admin privileges (run as administrator), and post the output of "bcdedit"?