Problem with Virgin Cable Broadband connection

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I have got very strange behaviour of my web browsers. I use mostly Mozilla but the same happen with IE7 and Opera9.6 I have no connection with most webpages. However I can connect certforums.co.uk but for example I can not connect to www.msn.com. I use cable virgin broadband.I have got network made of Belkin wired router.I have pinged loopback IP and my network is ok.I have pinged DNS servers too, it is fine as well.
I have released and renew connection but still problem.I have reflushed DNS still nothing.I have restarted router, modem and PC still the same.
The problem is that the webbrowser display only certain pages. I have checked firewall too and it is ok.
Do you think it is Virgin fault or DNS server or maybe any virus in my PC?
Without internet I can not do much and i am...

 

I deleted cache before and run antivirus scan too but nothing.
I have tried the nslookup www.msn.com and it says:
****Can't find server name for address 192.168.2.1 ( my gateway): non existent domain
****default servers are not available
DNS request time out

 

no, they do not work unfortuantely. Very strange.
But at least I can connect to certforums
any more ideas?

 

***Can't fine server name for address 208.67.222.222 : No response from server
Server: Unknown
Address: 208.67.222.222
***Unknown can't find server : No response from server

That what it says exactly

 

no it does not

 

Have you modified your hosts file in any way? also are you able to get msn.com, etc on another computer?

 

sorted now. Everything is ok now.But I do not know why.All day no internet and now it is back.
I suspect problem from virgin but not sure about it.
Thank you for helpfull posts, I have learned much from that.

 

Virgin's network infrastructure is ****. I regularly experience issues related to upstream DNS. Its usually resolved by changing the modem to a different upstream and rebooting - you might want to try that next time it happens. Touch wood, I haven't experienced a problem for about three months, but when I do, if the change of upstream doesn't fix it I just give up and switch to 3G on my laptop for internet access until its fixed - I can't bear those soul-destroying calls to first line idiots reading from a script.

 

I was on Virgin too until I changed to Be, they had some continual DNS issues, I google'd some other DNS servers and added them in, resolved the issue - or, if you ipconfig /flushdns - ipconfig /registerdns it will work for 5-10 minutes