master browser

You should be able to edit the registry for this one under HKeyLocal_Machine\System\CurrentControlSet\Services\Browser\Parameters\ and then set the IsDomainMaster Key to False.

The above path is for NT/2000 so it maywell be slightly different for 98.

Hope it helps

Well, I found 3 articles at Technet on this error, and each one says it could be something different.
Article 135464 says that your router is forwarding UDP broadcast. The article is here:
http://support.microsoft.com/default.aspx?scid=kb;en-us;135464
(please remove any spaces)

Article 143153 says that the subnet mask is incorrect on the client system (the Win98 machnine). That article is here:
http://support.microsoft.com/default.aspx?scid=kb;en-us;143153
(again, remove any spaces)

And article 224131 states that this could be due to a mismatched duplex setting on a switch. The switch could be on full duplex, while the NIC in the Win98 machine could be half duplex. That article is here:
http://support.microsoft.com/default.aspx?scid=kb;en-us;224131
(yep, spaces are evil!)

So, take a look at each article, and try what each one says until your problem is solved.

hope this helps

Point value changed by question poster.

Assuming that R1 have not to be the master browser, you could open Network Properties-File and printer sharing for Microsoft Networks-Properties and set Disabled the Master Browser properties.
Or open the Registry Editor and find all Keys "MaintainServerList" and change the value to 0.

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