Display Driver keeps crashing, how can I fix this?

So for a while now my PC has been doing this.
Usually while watching videos online the display drive will crash. The screen would go black. A message in the bottom right corner telling me that the display drive has stop working. On the screen I press Esc and the audio from the video can still be heard but the video itself is black. I have to refresh the page to get the video working again.

Anyone know how to fix this? TwT Im not very good with pc things.

Info~ (Im not sure what info is needed so I just paste everything~)

CPU Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
MOTHERBOARD Gigabyte Technology Co., Ltd. Z77-D3H
BIOS BIOS Date: 04/25/12 13:59:15 Ver: 04.06.05
Total memory 4.00 GB Usable 3.96 GB
HDD (1) SAMSUNG HD105SI ATA Device (2) Seagate Desktop USB Device (3) Seagate Desktop USB Device
SOUND CARD (1) NVIDIA High Definition Audio (2) Microsoft LifeCam VX-3000. (3) NVIDIA High Definition Audio (4) NVIDIA High Definition Audio (5) NVIDIA High Definition Audio (6) VIA High Definition Audio
GRAPHICS CARD NVIDIA GeForce GT 240
OS Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1

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