OS re install and serviio only sees half

So.....I had to re install my OS. I'm at Windows 8.1 just like before. When I went and re downloaded the latest version of serviio and installed it........now on my Samsung PN59D8000......Only about half my files will play ..... the other files that did previously play, just now say... unsupported file format.
I did find someone else on here that had a similar ish problem and they solved it by doing something with the router, so I called trendnet since I was having a few issues with wireless also and they had me update the firmware. ......But still I have only half my files playing....and subtitles aren't recognized anymore.
if anyone has any suggestions.....I'd love to hear em.
Thanks
I did find someone else on here that had a similar ish problem and they solved it by doing something with the router, so I called trendnet since I was having a few issues with wireless also and they had me update the firmware. ......But still I have only half my files playing....and subtitles aren't recognized anymore.
if anyone has any suggestions.....I'd love to hear em.

Thanks