Firefox unexpectedly falls over or halts temporaraly fixed by turning off hardware accelaration (unchecking use hardware acceleration when avalable). Halts seem to produce a crash report: Mozilla window remains but does not update (window draged across produce swearls) Faling over window just sudenly vanishes no crash report appears to have been made. Event Viewer aplication log shows error .date, time, Source: nview, Catagory: None, User: N/A, ... Log Description gives: failed to retreve modual name Strongly suspect interaction between Firefox 7.01 and nVidia graphics Driver details given in information below. Even with hardware acceloration disbled Firefox will halt when screensaver cuts in (wecome screen on resume)