Video problems over LAN

[llololloy]

Not been on these forums for quite a while, but I really hope you guys can help me fix this. Can't find anything similar when searching here or a general search via google.
Basically, I can't watch video files properly over the lan on one machine. The video starts, plays for a bit then stops.
But it's fine when played after copying to the local hard drive.
Another pc and a media streamer on the same lan play fine over the network.
It's also not every single video file. But when it does stop playing, it's usually after 5 or 10 minutes, but the length of playback time is not consistent. This is with mkv and avi files. It does the same thing in wmc, wmp and mpc so its not a codec or player issue.
My gut feeling is it's either the network adapter settings or the network switch. I've tried different drivers, still happens (though I watched a couple of files after the last driver change before the video stopped).
Motherboard is an asus m4a88t-d using the onboard ethernet. Running windows 7 x64 (I tried 32bit a while ago, still did it) with sp1 (did it before sp installed too).
Network switch is a tplink tl-sg1008d.
Would really appreciate some help.

[g8ina]

Are these hi def movies by any chance ?

On a G network, I found them to stutter too. On an N network they all work fine.

[llololloy]

sorry, thought I'd put in.
It's all wired using cat 5e or cat 6 gigabit ethernet cabling.
HD and SD both affected.
Cheers for the suggestion though.

[blueball]

have a you tried a different port on the switch?

[llololloy]

I think I have but I'll try again. Will do that now and then report back later. Cheers.

[llololloy]

so, tried different port. same problem.
tried a different cable in a different post, thought it had worked, played a couple of files without issue, started doing it again though last night and today.
I also set the router to fix the IP address on the lan as I noticed it moved when changing ports. still got the same issue.
Next step I think is to try another switch, will post back if anything changes.
Cheers for help so far.

[Biscuit]

dont WMP WMC and MPC all use the same codecs?

Download and try VLC, that definately has its own codecs built in so it will give you a definate answer if its a codec issue.

[nightcypher]

Trying different switches and different streaming apps would be my first suggestion. Also, double-check you've got the latest drivers for your network cards, as the problem could also be there.