Premiere was crashing on DVEDIT, even reinstalling it didn't work. So, decided to reinstall Win2K on it. Installed in another folder without removing the existing installation. Took network and promise ATA card drivers by choosing the oem0.inf and oem1.inf in the old WINNT\inf folder - found with notepad that these were their respective inf files, mentioning Promise and DLink. Windows did the rest, automagically installing the sound card also - ESS 1938.
After reinstall, the stop error and restart problem which I'd posted on PCQ forum is solved - so it was purely a software problem, as suspected. And of course Windows problems are best solved by reinstalls!
Installed WinK SP4 from PCQ Oct 2004 DVD, then Matrox video tools after the display driver.