It seems to go through the motions, downloading etc and when it is due to reconfigure itself, it disappears.
This is a new installation on a new laptop (previous computer worked ok).
Tried un-installing and re-installing uVision and Si8051F_uVision.exe driver.
Suggestions?
Check USB cable, try a different port. Try from a powered hub. Avoid docking station. Watch for drivers/filters interfering with USB (Dell Remote Diag, Intel Performance, Daemon Tools)