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Is this a Network (router?) probelm and if so, can you help?

Have a desktop PC running XP connected via a cable modem for internet/email access. Also have a Netgear router MR814v2 creating a network. Have run it all successfully with a PC Laptop and with my somewhat recent (6 months) Macbook connecting via network. All was working fine until?..
Recent change when I turn on Macbook, it connects to network, but when I try to load Safari (or connect to my university based email), Safari loads but cannot connect to internet (or get mail). Further, that also stops the desktop from accessing the internet or get mail, even though it says it is still connected. Laptop PC was able to do it's thing via network but either stops on it?s own or stops when I load Safari. Turning Macbook off does not even return access to the net via desktop, but if I remove the power from cable modem and then router and return the power, I get access on PC desktop back. Thus, it seems to me that Macbook is crashing the whole system, although system still came down with PC Laptop connecting. Tried to repair IP address (or whatever the Mac term is) but it did not help. When I tried to repair the desktop PC's IP address while system is not connecting, it is unable to do so.
Seems like this could be a router problem. Do you concur and if so, suggestions?
Thanks in advance.

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