I've searched this forum (and many others)and tried many of the suggestions to eliminate Stutter/Judder/Sync issues. My system is a dual boot W98SE & W2000 with SP4 Pentium4 2.8 with all high end components etc etc. My monitor is a CRT 17" Sony Trinitron Multiscan which can handle up to 120 Hz. My DVD player is a Pioneer A106 which gives a superb seamless layer change and is virtually silent. The issue I have is that under W98SE I can watch R1 DVD's on this monitor regardless of which DVD player I use (I have OEM versions of Power DVD 4, WinDVD5, NVDVD 2.2) without any stutter or jerkiness at all and in perfect sync with no frame skipping @ 1024x768 @ 85Hz. Yet when I try to playback a R1 DVD under W2K it always skips several times over the course of the SAME movie. ReClock makes no difference. Neither does changing the Audio Renderer or Sample Rate. I tried changing the Refresh Rate to 72 Hz or 100 Hz or 60 Hz and it makes no difference at all other than the stutter happens at a different time in the movie. Previously I used to experience smooth non stutter free playback under W2K @ 1024 x 768 @ 85Hz but then my HD had a head crash in the August heatwave and I had to rebuild my system from scratch. This I did using exactly the same drivers/service packs/hotfixes etc etc and the result is that my stuttering is back again. No background tasks are running which could interefere with the playback. I've scanned the registry and can find no hidden settings which affect the Refresh Rate. I have a GeForce4 which has the patch applied to allow greater than 60 Hz under W2K. Please can someone give me some pointers as to what could be causing the issue/what do I do to isolate this as I have run of of ideas.