Hello,
this specific error should never happen in normal conditions an it happens when one of our modules cannot be loaded; error 126, accordingly to the Windows SDK, means "The specified module could not be found" (ERROR_MOD_NOT_FOUND) so it's likely that for some reason the multimedia engine tries to extract one of the modules into the destination folder but when trying to load it the module is missing: it's likely that an antivirus or an antimalware could be blocking in some way this procedure due to a false positive?
As a second possibility, but it’s a very rare case, a power failure could have damaged some registry setting inside the Windows installation so the Windows SDK, through the SHGetSpecialFolderPath function, is no more able to retrieve the system folder which is used by our engine in order to create the temporary files. In this case it could be needed a new Windows installation because the system stability could be compromised. As mentioned, this is quite an extreme case.
Hope this helps
Kind Regards
Severino Delaurenti
MultiMedia Soft