black screen after sleep mode, windows 8

i upgraded my laptop HP dv6 to windows 8. i get black screen after i wake it up from sleep mode. as if the monitor doesnt have any power.
I solved the problem actually by updating my graphic card driver. 
but i was confused because i thought it was up to date. 
computer properties - device manager - display adapters - NVIDIA GeForce GT 230M 
i right clicked on NVIDIA GeForce GT 230M and than clicked update driver software. it told me that the driver was up to date.
but than i checked the nvidias website. there i found a newer version.
that was confusing. why windows cant find this newer version?

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Last updated June 28, 2020 Views 39,431 Applies to: