Download & video playback stops in the middle

In windows 7, when I download any file it stops at the middle and doesn't proceed. Likewise, when I play online videos (like youtube), streaming simply stops after playing few minutes and doesn't play the remaining part(it simply keeps on buffering and takes forever to complete). I have tried downloading file using download manager like download accelerator and several browsers like firefox, gooble chrome but it still have the same problem and download doesn't proceed even if i use pause/resume feature. By the way, I use 10 Mbps bandwidth cable internet/wireless router and McAfee Anti-virus which I update daily. In other to get rid of this problem, I even formatted my laptop and installed a fresh copy of 2 operation systems(both windows vista and windows 7). To my surprise, i found that this problem doesn't occur in my windows vista but the problem still exist in the newly installed Windows 7. This is really driving me crazy coz the problem seems to be really weird for me to figure out ...Any help??

Fill in your hardware specs and uninstall McCrappee. Use Microsoft Security Essentials - free, unobtrusive, and unlikely to block your downloads. Can you also post a screenshot of your installed apps? Search for snip in the start menu.

I don't know what the problem is, I can only say that I'm not having the problem, and I only have 1/3 your bandwidth. I can only think of four things to try...a different AV, firewall, don't use a download accelerator and try using Opera as the browser. You could just disable the first two items long enough to see what the effect was, before changing them permanently.

I have attached png image of my hardware specs and installed apps. The problem exists even if I disable my anti-virus.

Uninstall the codec pack and use Media Player Classic - Home cinema. Get either x86 or x64 depending on your system. Run a full system scan with Malwarebytes in safe mode after updating.

So I just got this new computer, running Windows 7 Home Premium. Everything was working fine at first, but then it automatically updated some things. Now, Flash doesn't work online anymore, in any browser. The content starts to load, then the browser freezes, and I have to force quit it.

I have the most recent version of Flash Player, and I can still play .swf files I make myself, so I don't know what to do anymore.

In a possibly related problem, .avi and other video files on my hard drive no longer play, nor do music files.

Thanks everyone for suggestions. Finally, got the solution. The problem is at the hardware level. I replaced my Netgear wireless router with Linksys Cisco router and now it works fine.:)