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Philadmin

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Office Network Issues

Hello All!

I assist a small office with technical issue from time to time and I encountered an issue that I just can't seem to solve:

Office equipment:
3Com Baseline 2924 Switch
DLink Wireless AC1750 Router
Motorola 585100 Cable Modem
Intel board Server, running Windows 2008 R2 Server.
Windows XP/7 clients

the Office has one Server that is a Primary file server that is also AD, DNS Server.

Problem:
I've been getting calls about the internet dropping and users losing connection to the server. My findings was that the old dlink router had issues so I replaced it with a new dlink wireless router. I also performed a dcdiag on the server and encountered some errors relating to DHCP and DNS. It turns out that the server IP config is a Class C subnet along with the router, both having a 192.168.X.X. for some reason, if I delete the static IP settings on the server and on the client PCs, they get internet access, however, if I do this, the clients don't have access to the server resources (share folders). But if I give a static IP or allow dynamic, client PCs have access, but no internet access. when I click the fix option in the "Network and Sharing Center" on the server, it tells me to setup DHCP.
I tried to create a Class A subnet for internal use, setup all clients with new IP subnet and, again, I can't get internet access???? So, now I went back to 192 subnet and now the server and clients get out and have access to server resources, but now, a user can launch a brower to Yahoo and Google as home page, it loads, they do a search, they get results. Now, here's the problem, when they click a link any link on this page, page doesn't load.

I turned off all firewalls,filters, Antivirus program and this still happens. I'm thinking the ISP has to provide a gateway address instead of the default router address and I need to plug this address in the "Default Gateway" field.

If anyone can shine a light on this issue, it would be greatly appreciated.

Phil
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Appreciate the quick response, I'll be paying the office a visit and try both suggestions... I'll let y'all know... Thanks.
I really apprecite the feedback!!! It turns out both of you seemed to be aligned with what needed to happen. There was a combination of corrections that were needed in my config. both responses provided the solution.

Thanks again!