It seems some graphic problem. Get latest graphic driver and install it. If it resolves the issue, then great. But it not, then you may try to change your screen resolution. In most of the monitors, 1280x800 and 1680x1050 resolutions are used for widescreen. To change the screen resolution, just follow the following steps:
- Click on Start.
- Click on Control Panel.
- Click on Adjust screen resolution under Appearance and Personalization.
- Now click on the Settings tab.
- You need to scroll down the arrow on front of Resolution.
- After adjusting the resolution, click on Apply and OK.
Hope this will help you.