Computer freezes when watching videosn full screen?

No matter what video I watch, when I turn it full screen after 10 minutes or so my computer screen turns blue and the only way to turn it off is by the switches. How do I fix it? Heres my specs. Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030) ... show more No matter what video I watch, when I turn it full screen after 10 minutes or so my computer screen turns blue and the only way to turn it off is by the switches. How do I fix it?
Heres my specs.
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: Z68AP-D3
BIOS: Award Modular BIOS v6.00PG
Processor: Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz (4 CPUs), ~3.7GHz
Memory: 8192MB RAM
Available OS Memory: 8110MB RAM
Page File: 2654MB used, 13562MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found

Card name: AMD Radeon HD 7700 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: AMD Radeon Graphics Processor (0x683D)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_683D&SUBSYS_271014...
Display Memory: 705 MB
Dedicated Memory: 1003 MB
Shared Memory: 3798 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: Acer G245HQ
Monitor Id: ACR012B
Native Mode: 1920 x 1080(p) (60.000Hz)
Output Type: HDMI
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