Downloading and streaming freezes

Hi,

I've been having recurrent problems with my internet connection in that streaming videos, regardless of the website, tend to initially load very fast and then suddenly freeze halfway through. As the video catches the buffer the video pauses and nothing happens unless I drag the cursor over the timeline and click it and the streaming continues again. This can sometimes occur 2 or 3 times during 5 minutes of video.

The problem has recently started occuring when downloading files as well, they often begin to download perfectly fine until suddenly stopping for no reason and with no error message. My internet connection doesn't drop and if I pause and resume the download it carries on just fine (sometimes freezing again reguring several more restarts), but as you can imagine this is extremely annoying and I want to resolve it.

I have tried using testing downloads of several different files, from different websites and using different browsers and all have the same result, streaming videos and files larger than aprx 50mb always freeze at some point before completion, however the point at which the freeze occurs is always random.

My ISP is Virgin Media (Cable/UK) and I suspected it was a problem on their end as I reset all my equipment and still the problem persisted. However, upon testing the problem on another PC on the same network, downloads and streaming videos work just fine without any interruptions. I tried disabling all anti virus, firewalls, placing my PC into DMZ, but none of these attempts made any difference.

My suspicion is on my end somewhere in my internet settings but I'm not quite sure how.

Any ideas?

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System Information
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Time of this report: 7/1/2012, 23:30:30
Machine name: BRYAN-PC
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.120402-0336)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 02/05/10 19:13:52 Ver: 08.00.10
Processor: Intel(R) Core(TM) i7-2600K CPU @ 4.40GHz (8 CPUs), ~3.4GHz
Memory: 8168MB RAM
Page File: 2873MB used, 13649MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 64bit Unicode