My computer suddenly won't buffer/load any videos on sites such as youtube, any help?

As the title says really. Suddenly my computer won't buffer any videos, and as far as i'm aware I havn't changed any settings. I'm using windows Vista, any ideas as to how I can fix my problem?

Mark

Load all defaults in Internet Explorer

Open IE (Internet Explorer 7)
Hit ALT on the keyboard to see the IE menu bar
Click on Tools - Internet Options
Start by Delete (all is good - if you know all your cached (copied) online passwords
Then go through each tab and restore defaults (reset on advanced)

Restart IE once done
You'll probably have MS settings page popup, just go through the settings
Then at last go to youtube.com and try again

If it still doesn't work
Go here http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash&promoid=BONRN
I always untick Google toolbar and then tick I agree and then Install now.

Try that, please report back if successfull

no success, tried all you said, and no luck, thanks anyway though.
I read on a form somewhere else it could be something like i have to format my LP or something? i've never heard of that or know how to do it?

OK try temporarily disabling your firewall (usually right click exit on the little tray icon)

Also in Privacy (back in Tools - options in IE) tick accept all

still no luck
do you know anything about LP format or something i read somewhere? im totally clueless as to what to do

Sorry no, not sure what you mean - music records ? maths ?

thanks for your help anyway ^_^