get a refund the game is broken and steam does not care and devs does not care

I have several games from uig entertainment, all of which ran without any problems. I haven't been able to start anything for two weeks. It only affects the UIG games, which all stop after the UIG logo.
Troubleshooting and possible solutions were unsuccessful.
The only change from before is a windows update, but even if I roll back to a previous restore point or uninstall the update (tried both) the UIG games won't run anymore.
The error code in the Windows log file indicates an error in the directplay or missing directX driver, which cannot be the case since nothing was uninstalled or installed.
I hope that someone can help me and has an idea or at best a solution.