Lost v-sync with Windows 7

[Les]

Hey all, didn't want to resort to begging, but I just can't get v-sync enabled in 1946 with Windows 7 Ultimate 64-bit, except in windowed mode, and was wondering if anyone knew of a fix.

I'm using the same nVidia drivers and user config that worked successfully with Vista Ultimate 64-bit. Have got v-sync forced on in global settings and the 1946 profile. Triple buffering's off in both. I can enable v-sync in DirectX mode, but then of course I lose all the OpenGL effects, which is worse than running in windowed mode.

Using nHancer and RivaTuner to over-ride the nVidia control panel hasn't helped. I must have tried almost every possible combination of control panel settings but the screen tearing persists.

Have re-installed using compatibility modes, from 4.07 clean off the DVD up to 4.09 and back again. Tried the latest nVidia drivers, but am currently using the 182.50 drivers that worked before, for compatibility with other programs. Had a look around the web but obviously haven't found any solutions that worked.

Anyone else getting the same thing or have any suggestions?