File .MKV stops after 5 minutes

[samit]

The film. Mkv 720p stops after 5 minutes and restart the PC (I use KMPlayer).
When I unplug the Ethernet cable, it works.
Why?

[unidentified]

See suggestions given in similar type of threads: Playing MKV files in Vista x64 Media Centre
MKV file converter required?

[Viceman]

I guess you would not have a problem with heating or power supply.

the fact to read certain files, called for more resources for your CPU, Graphic Card and Motherboard.

Check the temperature and fans with Everest.

As for;

When I unplug the Ethernet cable, it works.,

Check your firewall software is not blocking.

[samit]

I had already put KMPlayer in firewall exceptions. My MB is perhaps old Asus P5V-VMDH, but I have updated the BIOS.
I have a Core 2 Quad Q6600 and 4 GB of DDR2 RAM PC 5300 on Vista Ultimate 32-bit.
My graphic card is a Nvidia 7300 GS.
My normal temperatures are 32 degrees and 42° for the MB.
Given this information, do you think I should change the MB, and if so, what should I buy (socket 775, quad core compatible PC and 5300) not to exceed 70 euros, I do not play.
Thank you for the answer.

[Zachary]

I guess uninstall and reinstall the KMPlayer software or even try to add K lite codec pack and see if it works. Download K-Lite Mega Codec Pack 4.3.1 - Its Free !!