Finally got it to go through, 30 modifications in.
If the DVR is accessible over the lan, the problem is somewhere between your ISP and your router. I would first check to see if you really have a static IP. You could still setup a DynDNS account to make sure your IP is accessible. Use a open port tool to check and see if the IP and the individual ports are open and accessible. Make sure you turn off all firewall and antivirus software first on the computer and the router. After you get it working turn on the firewall and antivirus, checking to make sure that they are not a problem. Here is a open port tool that works easy.
"Well tried to post a Web site , but cant, Ive not posted the required 5 post."
So, goto DynDNS, the support tab, then dns tools, then open port tool
Hope it helps.