Hi Kiuru,
The appearance of your computer's display can be influenced by several factors. The monitor you use and its settings, how Windows is configured, and how you use your computer can all have an effect on display quality.
You need to look into the driver that is being used for your graphics card. Install the graphics card updates and check.
Drivers are updated occasionally. Windows can update them automatically, or you can install the updated drivers yourself. It's important for you to have confidence in the updated drivers you install. Windows notifies you if it detects a suspicious or unsafe driver you shouldn't install. Check for optional updates also as they might have hardware device related updates.
Download and install drivers: http://windows.microsoft.com/en-us/windows-8/all-drivers
http://windows.microsoft.com/en-us/windows-8/all-drivers
Windows Update: Frequently Asked Questions: http://windows.microsoft.com/en-us/windows-8/windows-update-faq
http://windows.microsoft.com/en-us/windows-8/windows-update-faq
Troubleshoot video card problems: http://windows.microsoft.com/en-in/windows-8/troubleshoot-video-card-problems
http://windows.microsoft.com/en-in/windows-8/troubleshoot-video-card-problems
You can also try this:
Set the computer for “Adjust for the better appearance” and check.
a. Click on Windows and X keys togetherand then click on Control Panel.
b. Click on the System and Maintenance link.
Note: If you're viewing the Classic View of Control Panel, you won't see this link. Simply double-click on the System icon and proceed to Step d.
c. Click on the System link.
d. In the task pane on the left, click the Advanced system settings link.
e. Locate the performance area and click on the Settings button.
f. Select the Adjust for the better appearance.
g. save the changes and check.
Hope this information helps you. Please do let us know if you need further assistance, we’ll be glad to assist you.