What OS are we talking about here?
XP has always been hit and miss for me when it comes to file/resource sharing on my internal network. It seems to work fine for a period of time, and then breaks for no apparent reason. In most cases, I've found turning file/printer sharing off and then turning it back on seems to resolve the issue.
Root cause of your initial problem is more than likely the fact that the new router assigned different ips to the PCs on the network, and the OS doesn't recognise them.
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