HI welcome to PCHF

the first thing to try would be updating your codecs try these ones
Free-Codecs.com : Download K-Lite Codec Pack 3.5.3 FULL, K-Lite Codec Pack 3.5.3 STANDARD, K-Lite Codec Pack 3.5.3 BASIC : K-Lite Codec Pack is a collection of codecs and related tools
Also check your color setting
To change the number of colors displayed on a monitor
1.
Open Display in Control Panel.
2.
On the
Settings tab, in the
Color quality list, click a different color setting.
Note
•To open Display, click
Start, click
Control Panel, click
Appearance and Themes, and then click
Display.
•Choose
Medium to display over 65,000 colors,
High to display over 16 million colors, and
Highest to display over 4 billion colors. Choosing more colors provides better color quality on your screen.
•Settings that display a larger number of colors normally require more computer memory and might affect performance on older computers.
•You can switch your color quality temporarily to 256 colors if you have games or other programs that perform better or must run at that level. To switch to 256 colors, right-click the game or program (on the desktop or on the
Start menu), and then click
Properties. Click the
Compatibility tab, and then select the
Run in 256 colors check box. Your display reverts to its default color quality when you close the program.
•Your monitor and video adapter determine the color settings that are available for your screen.
•Changes to the color settings affect all users that log on to the computer.
•Only the recommended color settings are listed. For additional settings, click the
Advanced button on the
Settings tab, click the
Adapter tab, and then click
List all Modes. Select the resolution, color level, and refresh rate you want.
•If you are using multiple monitors, you can specify the color settings for each installed monitor. If you click the icon for a secondary monitor, the
Extend my Windows desktop onto this monitor check box must be selected to change the settings for that monitor.