Hello everyone !

Is there any combination of hard-/software which is able to play HD video(1080p)flawless under Windows 98/ME ?

Assuming graphics card assisted decoding is not possible I'm guessing it could work if your CPU is fast enough. What video format are you talking about? ffdshow might be enough for all common formats, CoreAVC is a faster non-free h264 decoder alternative (at least old versions used to work on Win9x, don't know about more current ones).

I was able to get flawless 1280x720 h264 coded video playback on P4 2.4Ghz, without addidional GPU hardware acceleration. However, a few tricks were required to get such a result.

In my case the best combination were GOM Player + ffdshow + Haali Media Splitter. Still, the GOM Player does have some problems with mkv subtitle support. The BS Player handles the subtitles much better, but the playback is not flawless.