Sound & Video lagging while playing videos

I've a problem where i'll have a serious audio&video lag when i'm playing videos on youtube (360p - little lag, when i'm switching to fullscreen 1080p - serious lag!! ) that's also when i'm playing videos on iTunes, which is laggy than youtube. All of my driver are all up to date. On Windows media player, the videos run smoothly but goes little lag when i'm doing some background works. I can play HD videos on my computer smoothly without lag before i installed new graphic cards from Intel G33 to Nvidia Geforce 8400 GS. Anyone help me? thanx.

My PC Specs:

Pentium Dual Core e5400 @ 2.70GHz (2 CPUs), ~2.7GHz
2GB Ram
Nvidia GeForce 8400GS
1TB HDD
High Definition Audio Device
3 answers Last reply
More about sound video lagging playing videos
  1. Maybe your internet connection is a bit slow or your processor struggles
  2. my internet speed is 20Mbps. So, that's not a problem i think, if my processor struggles, how can i avoid it?
  3. Is it always 20Mbps. Sometimes when I'm on the internet the speed drops to 5 Kbps and I have a 1Mbps ADSL line.
    And remember that we have a 5.12 Terabits/ps line under the water connecting us with the rest of the world.
    Also, when high paying customers need bandwidth, they'll just reroute yours to them.
    Your processor might be damaged from overclocking or age.
    Another proposition might be that Windows is giving problems.
    Maybe get a second opinion since I am only fifteen
    Happy New Year and hope this helps.
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