can't stream video :(

[sony mavica]

so the PSU in my good pc is playing up so when i can save up enough to get a new one i have to use my old celeron desktop pc for the time my computer had a tv card in it i would use to watch tv on but lucky one tv channel i love to watch has a live stream online it has both hd 720p and 360p and 272p

but when i open the SD streams in vlc player the computer lags bad and vlc player freezes and cpu is on like 100%

my pc is windows xp celaron D 2.53ghz 1.49gb ram windows xp home

i have an older petuem 4 laptop that has only 512mb of ram and a slower cpu also running xp home but when i load up the streaming link it plays fine in vlc player on that pc i just hate using that laptop

but when i play 720p videos off my usb hdd on the celaron pc they load fast and play 100% fine unless they have a really high bitrate they might lag a tiny bit and my cpu stays around 60% to 85% and sd video 720x576 or lower play 100% fine without any problems

so im not sure why my computer is having truble playing the streaing link and i am also using the same usb wifi device on both computers

can anybody plz help as i really wanna watch tv soon as my fave show is on in about an hr or so

[sony mavica]

thank i will try lower the screen rez and see if that helps

[sony mavica]

i have tried changing the rez with no luck