DNS Issue - Internet

Hi. Recently i have been experiencing this issue on my network. We have a PDC and a BDC and my PDC runs windows 2003 AD and is the DNS server. However, recently when i click a website it takes forever to load but whilct it tries to load if i click the link immediately then the site opens fine. I think its a DNS issue but i dont know where to start looking to solve this. Please help.
BSTITAsked:
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oBdACommented:
Make sure that *all* domain members (including the DCs!) use *only* the DC(s - is your "BDC"* a DNS as well?) as DNS servers.
Then configure Forwarders on your DNS servers to forward external requests to your ISP, or simply rely on the root hints.
Details here:

10 DNS Errors That Will Kill Your Network
http://redmondmag.com/features/article.asp?EditorialsID=413

Frequently asked questions about Windows 2000 DNS and Windows Server 2003 DNS
http://support.microsoft.com/?kbid=291382

Best practices for DNS client settings in Windows 2000 Server and in Windows Server 2003
http://support.microsoft.com/?kbid=825036

* Note that in AD, there aren't "PDCs" and "BDCs" anymore--only DCs and FSMO role holders.
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Fly-BoyCommented:
Have you tried flushing the DNS records?
Log onto the DNS server, open the command prompt and enter: ipconfig /flushdns
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Fly-BoyCommented:
Sorry, almost forgot, then enter: ipconfig /registerdns
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