Downloading Large Files on the Internet

I have a problem downloading videos and large files on the internet. I have several computers connected into the network and they are working well except for the newly upgraded computer which has H67M-D2B3 Gigabyte motherboard and i5-2500 Intel quad core processor with windows 7 64-bit. I don’t think it’s the internet connection making this interruption on downloading huge files because I run a speed test and the result is perfect. Am I missing something? Do I need some drivers to resolve this issue? Please help I don’t know what’s the problem with this computer.
