Chances are with a windows game like this unless it is a chronic problem, rebooting your computer will fix this issue, but to your quesions:
If you have windows 7, and your current display driver allows it
You may increase the hardware acceleration to full and check if the issue persists.
a.Right-click on the Desktop and choose Personalize.
b.Click on "Display" (bottom right under see also)
c.Click on "Adjust resolution", click "Advanced Settings".
d.Switch to the Troubleshoot tab.
e.Click Change Settings.
f.Move the hardware acceleration slider to full.
Don't worry if it does not, my high end card does not lol
Update my video driver? (again windows 7)
Right click my computer, select properties
Select Device Manager
Under display adapters note the type of video card you have
You will have to research on the net for the most updated driver, and install it. You can also open you computer up and look to see if you can get the name off the hardware itself (model number would be great) unless this is onboard video then you will need the MoBo information.