Acer Aspire 6920 mkv playback problems

[out_sider]

I have an Acer Aspire 6920 and I've ben trying to watch some mkv files using the comunity codec pack and windows media classic (already tried k-lite codec and vlc) and I always get the same problem after a wille (it's not a well defined period) the video starts to get very slow and the audio all out of sinc and it's impossible to watch.
I dont think it is because the hardware seing that it runs quite well for some time.
If anyone could help would be great.
I have Vista Ultimate 32 bits with 4gb Ram (I know)

[Baldrick]

Moving you to our software playing section as this is not a streaming issue.

I would try uninstall the codec pack and just use latest ffdshow, haali media splitter, ac3filter and play using mpchc or mpc.

[out_sider]

Tried that but didn't work...keeps geting all jumpie and out of sink after 10 minutes

[Krispy Kritter]

Most playback issues are codec related. Since you have multiple players installed as well as a a couple codec packs, you are likely in a world of hurt trying to get it fixed. Try uninstalling all of your video players and codec packs using Add/Remove Programs. Reboot and try using an app such as CodecSniper to clean up any leftover codecs. You may also want to run a registry cleaner or two.

Then start over using Baldrick's suggestion above.