Unable to play DVDs or video_ts folder video  

Use something like SlySoft AnyDVD to rip the DVD-V disc to your local harddrive. Next, go on codecguide.com website to download the latest K-Lite Codec Pack (Full). On this same website, also check if there's a more recent update available for it as a separate download. During the install, choose to use MPC-HC (64-bit) for the player and madVR for the video renderer. The installer shows tons of options if you choose the Advanced installation method, but you can leave them at their defaults if you don't know what they are for. You can experiment with those later if you want, as simply running the installer again lets you change those options.

In MPC-HC, from the File menu that's in the main menu bar at the top, you can choose to open DVD. In the new window that appears, browse to the VIDEO_TS folder that can be found in the ripped content [that you got from using SlySoft AnyDVD or AnyDVD HD to rip the disc].

The madVR renderer is used mainly for upscaling video during playback. According to the specs that you have listed, your screen resolution is/appears to be 1920×1080. The resolution of a DVD-V disc is lower than this. Therefore, the upscaling technique that madVR uses will help to visibly improve the video quality. You can experiment with its various quality settings, but to get the best results you may want to keep in mind that madVR relies on the speed of your CPU. (CPU, not GPU.) During playback, you can press CTRL + J to toggle the statistics overlay that shows you info about playback performance.

I.e., the higher quality settings in madVR are CPU heavy so, if the playback stutters and/or becomes choppy, then try changing them to a lower setting that consumes less CPU resources, etc., and, also keep in mind that the high power consumption and the resulting fan noise from the CPU cooler can be another good reason to maybe want to avoid boosting the video quality up a little bit too high.

The reason why I always use the K-Lite Codec Pack Full from codecguide.com to play a movie (any format) is because I got so fed up with having to fix video playback problems. K-Lite Codec Pack (Basic/Standard/Full/Mega) and MPC-HC are actively maintained with frequent updates by the author who goes by the name of clsid. This software is what every HTPC enthusiast has been using literally for ages. On AVS Forum there are people who have built their own hyper-expensive Home Theater solutions around it. The best way to fix an inferior player program is to uninstall it and to forget that it exists.

reddwarf4ever said:

Have uninstalled 5Kplayer, trying to do a repair upgrade, although it usually fails, or has in the past. If no success will install K-Lite, but this is a driver pack, so should allow VLC player to work again.....I assume & hope......I set. VOB association to VLC, as it plays MKV MP4 etc ok, is there anything else I should look for in associations ?

VLC uses its own built-in codecs. This gives VLC the benefit of not being reliant on what codecs you have installed so, any broken codec installations, misconfigured codecs, etc. that you might have are effectively bypassed by it─but I ditched VLC more than 11 years ago because I kept having various problems with it like not being able to play certain video types or getting unsmooth playback results, and refusal to play certain DVDs. K-Lite Codec Pack does indeed give you the option to let it detect codec issues, and, if it detects those problems, it kindly asks to let it fix them for you. Problems with codecs can actually even cause a cascade of seemingly unrelated problems with other software, also including problems with Explorer. As an example, a long time ago the XviD codec that I had downloaded from the official XviD website was causing the thumbnail cache to get currupted, which, in turn, was causing Explorer to always freeze. The installer of K-Lite Codec Pack fixed this problem for me back then, whereas other video playback related software always kept breaking stuff until finally I quit using them altogether in favor of K-Lite Codec Pack, which is when all my video playback problems instantly vanished, permanently so. I am talking an entire decade of stable, smooth, playback, also including for Blu-ray rips with DTS HD MA or Dolby TrueHD audio bitstreaming over HDMI into my Emotiva UMC-200 processor/preamp during the past 9 years.