wireless router vista 64 bit

Getting message from windows vista 64, “another computer on your network has same ip addresss as this one.?

I recently set up a home network using a new computer running Windows Vista 64 bit, an existing computer on AT&T/Yahoo/SBC DSL line with Windows XP. I added a new Belkin N+ router and a wireless printer. Once in a while I get the above message. I checked my subnet mask on both computers and they both show 255.255.255.0. Shouldn’t one show .1 and the other .2 at the end of the subnet address? How do I fix this?
I loaded the Belkin setup cd on the new computer. I always use the new computer myself and that is where I get the message. I am pretty sure I set up as dynamic, not static. I will check that though

Connect Modem [wired] to Router [wireless] to PCs.
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Set router POWER OFF.
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Reset modem: With a straightened paperclip, press RESET button momentarily.
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Wait 60 secs.
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Set router POWER ON.
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Reset router: With a straightened paperclip, press RESET button momentarily.
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Wait 60 secs.
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PC Command Line:
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Click [Start] – Click [Run...] – enter: cmd, Click [OK]
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At the prompt (c:\…..>) enter: ipconfig /release, press [ENTER]
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At the prompt (c:\…..>) enter: ipconfig /renew, press [ENTER]
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TEST: Connect to Internet.
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If SUCCESS: Repeat Steps after PC Command Line on other PCs.
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If NO SUCCESS:
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At the prompt (c:\…..>) enter: ipconfig /all, press [ENTER]
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Ensure DHCP Enabled == YES
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If IP Address == 0.0.0.0 OR 169.254.0.0 to 169.254.255.255, connect Modem [wired] to Router [wired] to PCs and perform ALL steps again.
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