Windows 7 Taskbar crashes - everything else ok??

I have a Ideacenter K300 running Win7 home premium 64bit
Recently it developed an issue where the taskbar on the bottom of the screen crashes [ie is no longer visible] but everything else is still running fine. The Start icon is still there and working and all the desktop icons are fine too.
It just seems to go away randomly. Does not seem to correspond to anyl specific action. I'll just notice it is gone!
Tried backing up to the last restore point but that did not help.
Can it be restarted without rebooting? Rebooting brings it back, for awhile, then it is gone again ...
Anyone else have this issue?
thanks!

Did you check the autohide option in the task bar properties?was it enabled?
Also run the sfc /scannow command in DOS as the administrator
Cheers and regards,
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